build.log

build.log (text/plain), 98.11 KB, created by Agostino Sarubbo on 2020-12-04 07:44:41 UTC

 * Package:    dev-python/sphinxcontrib-blockdiag-2.0.0-r1
 * Repository: gentoo
 * Maintainer: [e-mail]
 * Upstream:   [e-mail]
 * USE:        abi_x86_64 amd64 elibc_glibc kernel_linux python_targets_python3_6 python_targets_python3_7 python_targets_python3_8 test userland_GNU
 * FEATURES:   network-sandbox preserve-libs sandbox test userpriv usersandbox


@@@@@ PLEASE PAY ATTENTION HERE!!! @@@@@
This information may help you to understand if this is a duplicate or if this bug exists after you pushed a fix;
This ebuild was merged at the following commit:
https://github.com/gentoo/gentoo/commit/22dd8cc0f1e79d9f6b5d894e7c09a358f71c91f7  (Thu Dec  3 18:23:33 UTC 2020)
@@@@@ END @@@@@



emerge --info:
Portage 3.0.11 (python 3.7.9-final-0, default/linux/amd64/17.1, gcc-10.2.0, glibc-2.32-r3, 4.19.102-gentoo x86_64)
=================================================================
System uname: Linux-4.19.102-gentoo-x86_64-Intel-R-_Xeon-R-_CPU_E5-2650_v4_@_2.20GHz-with-gentoo-2.7
KiB Mem:   264031048 total, 179477052 free
KiB Swap:          0 total,         0 free
sh bash 5.0_p18
ld GNU ld (Gentoo 2.35.1 p2) 2.35.1
app-shells/bash:          5.0_p18::gentoo
dev-lang/perl:            5.30.3-r1::gentoo
dev-lang/python:          2.7.18-r4::gentoo, 3.6.12::gentoo, 3.7.9::gentoo, 3.8.6::gentoo, 3.9.0::gentoo
dev-util/cmake:           3.19.1::gentoo
sys-apps/baselayout:      2.7-r1::gentoo
sys-apps/openrc:          0.42.1::gentoo
sys-apps/sandbox:         2.20::gentoo
sys-devel/autoconf:       2.13-r1::gentoo, 2.69-r5::gentoo
sys-devel/automake:       1.16.3-r1::gentoo
sys-devel/binutils:       2.35.1-r1::gentoo
sys-devel/gcc:            10.2.0-r3::gentoo
sys-devel/gcc-config:     2.3.2-r1::gentoo
sys-devel/libtool:        2.4.6-r6::gentoo
sys-devel/make:           4.3::gentoo
sys-kernel/linux-headers: 5.9::gentoo (virtual/os-headers)
sys-libs/glibc:           2.32-r3::gentoo
Repositories:

gentoo
    location: /usr/portage
    sync-type: rsync
    sync-uri: rsync://rsync.gentoo.org/gentoo-portage
    priority: -1000
    sync-rsync-verify-metamanifest: yes
    sync-rsync-verify-max-age: 24
    sync-rsync-verify-jobs: 1
    sync-rsync-extra-opts: 

ACCEPT_KEYWORDS="amd64 ~amd64"
ACCEPT_LICENSE="* BSD"
CBUILD="x86_64-pc-linux-gnu"
CFLAGS="-O2 -pipe -march=x86-64 -frecord-gcc-switches"
CHOST="x86_64-pc-linux-gnu"
CONFIG_PROTECT="/etc /usr/share/gnupg/qualified.txt"
CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/env.d /etc/gconf /etc/gentoo-release /etc/revdep-rebuild /etc/sandbox.d /etc/terminfo"
CXXFLAGS="-O2 -pipe -march=x86-64 -frecord-gcc-switches"
DISTDIR="/var/tmp/portage/dev-python/sphinxcontrib-blockdiag-2.0.0-r1/distdir"
EMERGE_DEFAULT_OPTS="--with-bdeps=y -1 -k -b"
ENV_UNSET="CARGO_HOME DBUS_SESSION_BUS_ADDRESS DISPLAY GOBIN GOPATH PERL5LIB PERL5OPT PERLPREFIX PERL_CORE PERL_MB_OPT PERL_MM_OPT XAUTHORITY XDG_CACHE_HOME XDG_CONFIG_HOME XDG_DATA_HOME XDG_RUNTIME_DIR"
FCFLAGS="-O2 -pipe -march=x86-64 -frecord-gcc-switches"
FEATURES="assume-digests binpkg-docompress binpkg-dostrip binpkg-logs buildpkg config-protect-if-modified distlocks ebuild-locks fixlafiles ipc-sandbox merge-sync multilib-strict network-sandbox news parallel-fetch pid-sandbox preserve-libs protect-owned qa-unresolved-soname-deps sandbox sfperms sign split-log strict test unknown-features-warn unmerge-logs unmerge-orphans userfetch userpriv usersandbox usersync xattr"
FFLAGS="-O2 -pipe -march=x86-64 -frecord-gcc-switches"
GENTOO_MIRRORS="http://distfiles.gentoo.org"
LANG="en_US.utf8"
LDFLAGS="-Wl,-O1 -Wl,--as-needed -Wl,--defsym=__gentoo_check_ldflags__=0"
MAKEOPTS="-j48 V=1"
PKGDIR="/root/.packages"
PORTAGE_CONFIGROOT="/"
PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --omit-dir-times --compress --force --whole-file --delete --stats --human-readable --timeout=180 --exclude=/distfiles --exclude=/local --exclude=/packages --exclude=/.git"
PORTAGE_TMPDIR="/var/tmp"
USE="acl amd64 berkdb bzip2 cli crypt dri elogind fortran gdbm iconv ipv6 jumbo-build libglvnd libtirpc multilib native-symlinks ncurses nls nptl openmp pam pcre readline seccomp split-usr ssl tcpd test unicode xattr zlib" ABI_X86="64" ELIBC="glibc" KERNEL="linux" PYTHON_TARGETS="python3_6 python3_7 python3_8" USERLAND="GNU"
Unset:  CC, CPPFLAGS, CTARGET, CXX, INSTALL_MASK, LC_ALL, LINGUAS, PORTAGE_BINHOST, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS





emerge history:
2020-12-03T22:56:48 >>> dev-python/toml
2020-12-03T22:56:49 >>> dev-python/webcolors
2020-12-03T22:56:51 >>> dev-python/imagesize
2020-12-03T22:56:50 >>> dev-python/olefile
2020-12-03T22:56:48 >>> dev-python/pygments
2020-12-03T22:56:50 >>> dev-python/alabaster
2020-12-03T22:56:51 >>> dev-python/snowballstemmer
2020-12-03T22:56:52 >>> dev-python/typed-ast
2020-12-03T22:56:53 >>> dev-python/pytz
2020-12-03T22:56:52 >>> dev-python/pyparsing
2020-12-03T22:56:49 >>> dev-python/funcparserlib
2020-12-03T22:57:11 >>> dev-python/pyproject2setuppy
2020-12-03T22:57:12 >>> dev-python/zipp
2020-12-03T22:57:23 >>> dev-python/pillow
2020-12-03T22:57:28 >>> dev-python/docutils
2020-12-03T22:57:57 >>> dev-python/packaging
2020-12-03T22:58:01 >>> dev-python/importlib_resources
2020-12-03T22:58:21 >>> dev-python/backports-zoneinfo
2020-12-03T22:58:27 >>> dev-python/Babel
2020-12-03T22:58:05 >>> dev-python/blockdiag
2020-12-03T22:58:43 >>> dev-python/sphinxcontrib-applehelp
2020-12-03T22:58:52 >>> dev-python/sphinxcontrib-devhelp
2020-12-03T22:58:58 >>> dev-python/sphinxcontrib-jsmath
2020-12-03T22:59:04 >>> dev-python/sphinxcontrib-htmlhelp
2020-12-03T22:59:11 >>> dev-python/sphinxcontrib-serializinghtml
2020-12-03T22:59:17 >>> dev-python/sphinxcontrib-qthelp
2020-12-03T22:59:24 >>> dev-python/sphinx
2020-12-03T22:59:36 >>> dev-python/sphinxcontrib-blockdiag
2020-12-03T23:00:02 >>> media-libs/freetype
2020-12-03T23:00:04 >>> media-libs/libart_lgpl
2020-12-03T23:00:04 >>> media-libs/libjpeg-turbo
2020-12-03T23:00:05 >>> dev-python/mock
2020-12-03T23:00:06 >>> dev-lang/nasm
2020-12-03T23:00:05 >>> dev-python/nose
2020-12-03T23:00:33 >>> virtual/jpeg
2020-12-03T23:00:07 >>> dev-python/sphinx-testing
2020-12-03T23:00:41 >>> media-libs/tiff
2020-12-03T23:01:36 >>> dev-python/pillow
2020-12-03T23:03:38 >>> dev-python/reportlab


>>> Unpacking source...
>>> Unpacking sphinxcontrib-blockdiag-2.0.0.tar.gz to /var/tmp/portage/dev-python/sphinxcontrib-blockdiag-2.0.0-r1/work
>>> Source unpacked in /var/tmp/portage/dev-python/sphinxcontrib-blockdiag-2.0.0-r1/work
>>> Preparing source in /var/tmp/portage/dev-python/sphinxcontrib-blockdiag-2.0.0-r1/work/sphinxcontrib-blockdiag-2.0.0 ...
>>> Source prepared.
>>> Configuring source in /var/tmp/portage/dev-python/sphinxcontrib-blockdiag-2.0.0-r1/work/sphinxcontrib-blockdiag-2.0.0 ...
>>> Source configured.
>>> Compiling source in /var/tmp/portage/dev-python/sphinxcontrib-blockdiag-2.0.0-r1/work/sphinxcontrib-blockdiag-2.0.0 ...
 * python3_6: running distutils-r1_run_phase distutils-r1_python_compile
python3.6 setup.py build -j 48
running build
running build_py
creating /var/tmp/portage/dev-python/sphinxcontrib-blockdiag-2.0.0-r1/work/sphinxcontrib-blockdiag-2.0.0-python3_6/lib/sphinxcontrib
copying sphinxcontrib/__init__.py -> /var/tmp/portage/dev-python/sphinxcontrib-blockdiag-2.0.0-r1/work/sphinxcontrib-blockdiag-2.0.0-python3_6/lib/sphinxcontrib
copying sphinxcontrib/blockdiag.py -> /var/tmp/portage/dev-python/sphinxcontrib-blockdiag-2.0.0-r1/work/sphinxcontrib-blockdiag-2.0.0-python3_6/lib/sphinxcontrib
running egg_info
creating sphinxcontrib_blockdiag.egg-info
writing sphinxcontrib_blockdiag.egg-info/PKG-INFO
writing dependency_links to sphinxcontrib_blockdiag.egg-info/dependency_links.txt
writing namespace_packages to sphinxcontrib_blockdiag.egg-info/namespace_packages.txt
writing requirements to sphinxcontrib_blockdiag.egg-info/requires.txt
writing top-level names to sphinxcontrib_blockdiag.egg-info/top_level.txt
writing manifest file 'sphinxcontrib_blockdiag.egg-info/SOURCES.txt'
reading manifest file 'sphinxcontrib_blockdiag.egg-info/SOURCES.txt'
reading manifest template 'MANIFEST.in'
warning: no files found matching 'CHANGES.*'
writing manifest file 'sphinxcontrib_blockdiag.egg-info/SOURCES.txt'
warning: build_py: byte-compiling is disabled, skipping.

 * python3_7: running distutils-r1_run_phase distutils-r1_python_compile
python3.7 setup.py build -j 48
running build
running build_py
creating /var/tmp/portage/dev-python/sphinxcontrib-blockdiag-2.0.0-r1/work/sphinxcontrib-blockdiag-2.0.0-python3_7/lib/sphinxcontrib
copying sphinxcontrib/__init__.py -> /var/tmp/portage/dev-python/sphinxcontrib-blockdiag-2.0.0-r1/work/sphinxcontrib-blockdiag-2.0.0-python3_7/lib/sphinxcontrib
copying sphinxcontrib/blockdiag.py -> /var/tmp/portage/dev-python/sphinxcontrib-blockdiag-2.0.0-r1/work/sphinxcontrib-blockdiag-2.0.0-python3_7/lib/sphinxcontrib
running egg_info
writing sphinxcontrib_blockdiag.egg-info/PKG-INFO
writing dependency_links to sphinxcontrib_blockdiag.egg-info/dependency_links.txt
writing namespace_packages to sphinxcontrib_blockdiag.egg-info/namespace_packages.txt
writing requirements to sphinxcontrib_blockdiag.egg-info/requires.txt
writing top-level names to sphinxcontrib_blockdiag.egg-info/top_level.txt
reading manifest file 'sphinxcontrib_blockdiag.egg-info/SOURCES.txt'
reading manifest template 'MANIFEST.in'
warning: no files found matching 'CHANGES.*'
writing manifest file 'sphinxcontrib_blockdiag.egg-info/SOURCES.txt'
warning: build_py: byte-compiling is disabled, skipping.

 * python3_8: running distutils-r1_run_phase distutils-r1_python_compile
python3.8 setup.py build -j 48
running build
running build_py
creating /var/tmp/portage/dev-python/sphinxcontrib-blockdiag-2.0.0-r1/work/sphinxcontrib-blockdiag-2.0.0-python3_8/lib/sphinxcontrib
copying sphinxcontrib/__init__.py -> /var/tmp/portage/dev-python/sphinxcontrib-blockdiag-2.0.0-r1/work/sphinxcontrib-blockdiag-2.0.0-python3_8/lib/sphinxcontrib
copying sphinxcontrib/blockdiag.py -> /var/tmp/portage/dev-python/sphinxcontrib-blockdiag-2.0.0-r1/work/sphinxcontrib-blockdiag-2.0.0-python3_8/lib/sphinxcontrib
running egg_info
writing sphinxcontrib_blockdiag.egg-info/PKG-INFO
writing dependency_links to sphinxcontrib_blockdiag.egg-info/dependency_links.txt
writing namespace_packages to sphinxcontrib_blockdiag.egg-info/namespace_packages.txt
writing requirements to sphinxcontrib_blockdiag.egg-info/requires.txt
writing top-level names to sphinxcontrib_blockdiag.egg-info/top_level.txt
reading manifest file 'sphinxcontrib_blockdiag.egg-info/SOURCES.txt'
reading manifest template 'MANIFEST.in'
warning: no files found matching 'CHANGES.*'
writing manifest file 'sphinxcontrib_blockdiag.egg-info/SOURCES.txt'
warning: build_py: byte-compiling is disabled, skipping.

>>> Source compiled.
>>> Test phase: dev-python/sphinxcontrib-blockdiag-2.0.0-r1
 * python3_6: running distutils-r1_run_phase python_test
tests.test_basic.test_build_epub ... ERROR
tests.test_basic.test_build_html ... ERROR
tests.test_basic.test_build_json ... ERROR
tests.test_basic.test_build_latex ... ERROR
tests.test_basic.test_build_singlehtml ... ERROR
test_font_settings_error (tests.test_errors.TestSphinxcontribBlockdiagErrors) ... ERROR
.. blockdiag:: ... ERROR
test_rendering_error (tests.test_errors.TestSphinxcontribBlockdiagErrors) ... ERROR
test_reportlab_not_found_error (tests.test_errors.TestSphinxcontribBlockdiagErrors) ... ERROR
test_unknown_format_error (tests.test_errors.TestSphinxcontribBlockdiagErrors) ... ERROR
.. blockdiag:: ... ERROR
.. blockdiag:: ... ERROR
.. blockdiag:: ... ERROR
This testcase checks that autoclass plugin is unloaded correctly (and it does not effect to other diagram). ... ERROR
.. blockdiag:: ... ERROR
.. blockdiag:: ... ERROR
.. blockdiag:: ... ERROR
.. blockdiag:: ... ERROR
.. blockdiag:: ... ERROR
.. blockdiag:: ... ERROR
.. blockdiag:: ... ERROR
.. blockdiag:: ... ERROR
.. blockdiag:: ... ERROR
.. blockdiag:: ... ERROR
.. blockdiag:: ... ERROR
.. _target: ... ERROR
.. _hello world: ... ERROR
.. _target: ... ERROR
.. _hello world: ... ERROR
.. blockdiag:: ... ERROR
.. blockdiag:: ... ERROR
.. blockdiag:: ... ERROR
.. blockdiag:: ... ERROR
.. blockdiag:: ... ERROR
.. blockdiag:: ... ERROR
.. blockdiag:: ... ERROR
.. blockdiag:: ... ERROR

======================================================================
ERROR: tests.test_basic.test_build_epub
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 409, in load_extension
    mod = import_module(extname)
  File "/usr/lib64/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/epub3.py", line 20, in <module>
    from sphinx.builders import _epub_base
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/_epub_base.py", line 25, in <module>
    from sphinx.builders.html import BuildInfo, StandaloneHTMLBuilder
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/html/__init__.py", line 1186, in <module>
    import sphinxcontrib.serializinghtml  # NOQA
ModuleNotFoundError: No module named 'sphinxcontrib.serializinghtml'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/nose/case.py", line 197, in runTest
    self.test(*self.arg)
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 168, in decorator
    app = TestApp(*self.sphinxargs, **sphinxkwargs)
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 102, in __init__
    verbosity, parallel)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 240, in __init__
    self.setup_extension(extension)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 398, in setup_extension
    self.registry.load_extension(self, extname)
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 413, in load_extension
    err) from err
sphinx.errors.ExtensionError: Could not import extension sphinx.builders.epub3 (exception: No module named 'sphinxcontrib.serializinghtml')

======================================================================
ERROR: tests.test_basic.test_build_html
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 409, in load_extension
    mod = import_module(extname)
  File "/usr/lib64/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/epub3.py", line 20, in <module>
    from sphinx.builders import _epub_base
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/_epub_base.py", line 25, in <module>
    from sphinx.builders.html import BuildInfo, StandaloneHTMLBuilder
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/html/__init__.py", line 1186, in <module>
    import sphinxcontrib.serializinghtml  # NOQA
ModuleNotFoundError: No module named 'sphinxcontrib.serializinghtml'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/nose/case.py", line 197, in runTest
    self.test(*self.arg)
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 168, in decorator
    app = TestApp(*self.sphinxargs, **sphinxkwargs)
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 102, in __init__
    verbosity, parallel)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 240, in __init__
    self.setup_extension(extension)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 398, in setup_extension
    self.registry.load_extension(self, extname)
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 413, in load_extension
    err) from err
sphinx.errors.ExtensionError: Could not import extension sphinx.builders.epub3 (exception: No module named 'sphinxcontrib.serializinghtml')

======================================================================
ERROR: tests.test_basic.test_build_json
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 409, in load_extension
    mod = import_module(extname)
  File "/usr/lib64/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/epub3.py", line 20, in <module>
    from sphinx.builders import _epub_base
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/_epub_base.py", line 25, in <module>
    from sphinx.builders.html import BuildInfo, StandaloneHTMLBuilder
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/html/__init__.py", line 1186, in <module>
    import sphinxcontrib.serializinghtml  # NOQA
ModuleNotFoundError: No module named 'sphinxcontrib.serializinghtml'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/nose/case.py", line 197, in runTest
    self.test(*self.arg)
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 168, in decorator
    app = TestApp(*self.sphinxargs, **sphinxkwargs)
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 102, in __init__
    verbosity, parallel)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 240, in __init__
    self.setup_extension(extension)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 398, in setup_extension
    self.registry.load_extension(self, extname)
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 413, in load_extension
    err) from err
sphinx.errors.ExtensionError: Could not import extension sphinx.builders.epub3 (exception: No module named 'sphinxcontrib.serializinghtml')

======================================================================
ERROR: tests.test_basic.test_build_latex
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 409, in load_extension
    mod = import_module(extname)
  File "/usr/lib64/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/epub3.py", line 20, in <module>
    from sphinx.builders import _epub_base
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/_epub_base.py", line 25, in <module>
    from sphinx.builders.html import BuildInfo, StandaloneHTMLBuilder
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/html/__init__.py", line 1186, in <module>
    import sphinxcontrib.serializinghtml  # NOQA
ModuleNotFoundError: No module named 'sphinxcontrib.serializinghtml'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/nose/case.py", line 197, in runTest
    self.test(*self.arg)
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 168, in decorator
    app = TestApp(*self.sphinxargs, **sphinxkwargs)
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 102, in __init__
    verbosity, parallel)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 240, in __init__
    self.setup_extension(extension)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 398, in setup_extension
    self.registry.load_extension(self, extname)
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 413, in load_extension
    err) from err
sphinx.errors.ExtensionError: Could not import extension sphinx.builders.epub3 (exception: No module named 'sphinxcontrib.serializinghtml')

======================================================================
ERROR: tests.test_basic.test_build_singlehtml
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 409, in load_extension
    mod = import_module(extname)
  File "/usr/lib64/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/epub3.py", line 20, in <module>
    from sphinx.builders import _epub_base
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/_epub_base.py", line 25, in <module>
    from sphinx.builders.html import BuildInfo, StandaloneHTMLBuilder
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/html/__init__.py", line 1186, in <module>
    import sphinxcontrib.serializinghtml  # NOQA
ModuleNotFoundError: No module named 'sphinxcontrib.serializinghtml'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/nose/case.py", line 197, in runTest
    self.test(*self.arg)
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 168, in decorator
    app = TestApp(*self.sphinxargs, **sphinxkwargs)
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 102, in __init__
    verbosity, parallel)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 240, in __init__
    self.setup_extension(extension)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 398, in setup_extension
    self.registry.load_extension(self, extname)
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 413, in load_extension
    err) from err
sphinx.errors.ExtensionError: Could not import extension sphinx.builders.epub3 (exception: No module named 'sphinxcontrib.serializinghtml')

======================================================================
ERROR: test_font_settings_error (tests.test_errors.TestSphinxcontribBlockdiagErrors)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 409, in load_extension
    mod = import_module(extname)
  File "/usr/lib64/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/epub3.py", line 20, in <module>
    from sphinx.builders import _epub_base
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/_epub_base.py", line 25, in <module>
    from sphinx.builders.html import BuildInfo, StandaloneHTMLBuilder
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/html/__init__.py", line 1186, in <module>
    import sphinxcontrib.serializinghtml  # NOQA
ModuleNotFoundError: No module named 'sphinxcontrib.serializinghtml'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 168, in decorator
    app = TestApp(*self.sphinxargs, **sphinxkwargs)
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 102, in __init__
    verbosity, parallel)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 240, in __init__
    self.setup_extension(extension)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 398, in setup_extension
    self.registry.load_extension(self, extname)
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 413, in load_extension
    err) from err
sphinx.errors.ExtensionError: Could not import extension sphinx.builders.epub3 (exception: No module named 'sphinxcontrib.serializinghtml')

======================================================================
ERROR: .. blockdiag::
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 409, in load_extension
    mod = import_module(extname)
  File "/usr/lib64/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/epub3.py", line 20, in <module>
    from sphinx.builders import _epub_base
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/_epub_base.py", line 25, in <module>
    from sphinx.builders.html import BuildInfo, StandaloneHTMLBuilder
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/html/__init__.py", line 1186, in <module>
    import sphinxcontrib.serializinghtml  # NOQA
ModuleNotFoundError: No module named 'sphinxcontrib.serializinghtml'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 168, in decorator
    app = TestApp(*self.sphinxargs, **sphinxkwargs)
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 102, in __init__
    verbosity, parallel)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 240, in __init__
    self.setup_extension(extension)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 398, in setup_extension
    self.registry.load_extension(self, extname)
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 413, in load_extension
    err) from err
sphinx.errors.ExtensionError: Could not import extension sphinx.builders.epub3 (exception: No module named 'sphinxcontrib.serializinghtml')

======================================================================
ERROR: test_rendering_error (tests.test_errors.TestSphinxcontribBlockdiagErrors)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 409, in load_extension
    mod = import_module(extname)
  File "/usr/lib64/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/epub3.py", line 20, in <module>
    from sphinx.builders import _epub_base
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/_epub_base.py", line 25, in <module>
    from sphinx.builders.html import BuildInfo, StandaloneHTMLBuilder
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/html/__init__.py", line 1186, in <module>
    import sphinxcontrib.serializinghtml  # NOQA
ModuleNotFoundError: No module named 'sphinxcontrib.serializinghtml'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 168, in decorator
    app = TestApp(*self.sphinxargs, **sphinxkwargs)
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 102, in __init__
    verbosity, parallel)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 240, in __init__
    self.setup_extension(extension)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 398, in setup_extension
    self.registry.load_extension(self, extname)
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 413, in load_extension
    err) from err
sphinx.errors.ExtensionError: Could not import extension sphinx.builders.epub3 (exception: No module named 'sphinxcontrib.serializinghtml')

======================================================================
ERROR: test_reportlab_not_found_error (tests.test_errors.TestSphinxcontribBlockdiagErrors)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 409, in load_extension
    mod = import_module(extname)
  File "/usr/lib64/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/epub3.py", line 20, in <module>
    from sphinx.builders import _epub_base
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/_epub_base.py", line 25, in <module>
    from sphinx.builders.html import BuildInfo, StandaloneHTMLBuilder
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/html/__init__.py", line 1186, in <module>
    import sphinxcontrib.serializinghtml  # NOQA
ModuleNotFoundError: No module named 'sphinxcontrib.serializinghtml'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 168, in decorator
    app = TestApp(*self.sphinxargs, **sphinxkwargs)
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 102, in __init__
    verbosity, parallel)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 240, in __init__
    self.setup_extension(extension)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 398, in setup_extension
    self.registry.load_extension(self, extname)
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 413, in load_extension
    err) from err
sphinx.errors.ExtensionError: Could not import extension sphinx.builders.epub3 (exception: No module named 'sphinxcontrib.serializinghtml')

======================================================================
ERROR: test_unknown_format_error (tests.test_errors.TestSphinxcontribBlockdiagErrors)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 409, in load_extension
    mod = import_module(extname)
  File "/usr/lib64/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/epub3.py", line 20, in <module>
    from sphinx.builders import _epub_base
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/_epub_base.py", line 25, in <module>
    from sphinx.builders.html import BuildInfo, StandaloneHTMLBuilder
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/html/__init__.py", line 1186, in <module>
    import sphinxcontrib.serializinghtml  # NOQA
ModuleNotFoundError: No module named 'sphinxcontrib.serializinghtml'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 168, in decorator
    app = TestApp(*self.sphinxargs, **sphinxkwargs)
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 102, in __init__
    verbosity, parallel)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 240, in __init__
    self.setup_extension(extension)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 398, in setup_extension
    self.registry.load_extension(self, extname)
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 413, in load_extension
    err) from err
sphinx.errors.ExtensionError: Could not import extension sphinx.builders.epub3 (exception: No module named 'sphinxcontrib.serializinghtml')

======================================================================
ERROR: .. blockdiag::
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 409, in load_extension
    mod = import_module(extname)
  File "/usr/lib64/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/epub3.py", line 20, in <module>
    from sphinx.builders import _epub_base
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/_epub_base.py", line 25, in <module>
    from sphinx.builders.html import BuildInfo, StandaloneHTMLBuilder
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/html/__init__.py", line 1186, in <module>
    import sphinxcontrib.serializinghtml  # NOQA
ModuleNotFoundError: No module named 'sphinxcontrib.serializinghtml'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 168, in decorator
    app = TestApp(*self.sphinxargs, **sphinxkwargs)
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 102, in __init__
    verbosity, parallel)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 240, in __init__
    self.setup_extension(extension)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 398, in setup_extension
    self.registry.load_extension(self, extname)
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 413, in load_extension
    err) from err
sphinx.errors.ExtensionError: Could not import extension sphinx.builders.epub3 (exception: No module named 'sphinxcontrib.serializinghtml')

======================================================================
ERROR: .. blockdiag::
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 409, in load_extension
    mod = import_module(extname)
  File "/usr/lib64/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/epub3.py", line 20, in <module>
    from sphinx.builders import _epub_base
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/_epub_base.py", line 25, in <module>
    from sphinx.builders.html import BuildInfo, StandaloneHTMLBuilder
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/html/__init__.py", line 1186, in <module>
    import sphinxcontrib.serializinghtml  # NOQA
ModuleNotFoundError: No module named 'sphinxcontrib.serializinghtml'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 168, in decorator
    app = TestApp(*self.sphinxargs, **sphinxkwargs)
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 102, in __init__
    verbosity, parallel)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 240, in __init__
    self.setup_extension(extension)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 398, in setup_extension
    self.registry.load_extension(self, extname)
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 413, in load_extension
    err) from err
sphinx.errors.ExtensionError: Could not import extension sphinx.builders.epub3 (exception: No module named 'sphinxcontrib.serializinghtml')

======================================================================
ERROR: .. blockdiag::
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 409, in load_extension
    mod = import_module(extname)
  File "/usr/lib64/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/epub3.py", line 20, in <module>
    from sphinx.builders import _epub_base
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/_epub_base.py", line 25, in <module>
    from sphinx.builders.html import BuildInfo, StandaloneHTMLBuilder
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/html/__init__.py", line 1186, in <module>
    import sphinxcontrib.serializinghtml  # NOQA
ModuleNotFoundError: No module named 'sphinxcontrib.serializinghtml'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 168, in decorator
    app = TestApp(*self.sphinxargs, **sphinxkwargs)
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 102, in __init__
    verbosity, parallel)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 240, in __init__
    self.setup_extension(extension)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 398, in setup_extension
    self.registry.load_extension(self, extname)
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 413, in load_extension
    err) from err
sphinx.errors.ExtensionError: Could not import extension sphinx.builders.epub3 (exception: No module named 'sphinxcontrib.serializinghtml')

======================================================================
ERROR: This testcase checks that autoclass plugin is unloaded correctly (and it does not effect to other diagram).
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 409, in load_extension
    mod = import_module(extname)
  File "/usr/lib64/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/epub3.py", line 20, in <module>
    from sphinx.builders import _epub_base
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/_epub_base.py", line 25, in <module>
    from sphinx.builders.html import BuildInfo, StandaloneHTMLBuilder
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/html/__init__.py", line 1186, in <module>
    import sphinxcontrib.serializinghtml  # NOQA
ModuleNotFoundError: No module named 'sphinxcontrib.serializinghtml'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 168, in decorator
    app = TestApp(*self.sphinxargs, **sphinxkwargs)
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 102, in __init__
    verbosity, parallel)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 240, in __init__
    self.setup_extension(extension)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 398, in setup_extension
    self.registry.load_extension(self, extname)
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 413, in load_extension
    err) from err
sphinx.errors.ExtensionError: Could not import extension sphinx.builders.epub3 (exception: No module named 'sphinxcontrib.serializinghtml')

======================================================================
ERROR: .. blockdiag::
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 409, in load_extension
    mod = import_module(extname)
  File "/usr/lib64/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/epub3.py", line 20, in <module>
    from sphinx.builders import _epub_base
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/_epub_base.py", line 25, in <module>
    from sphinx.builders.html import BuildInfo, StandaloneHTMLBuilder
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/html/__init__.py", line 1186, in <module>
    import sphinxcontrib.serializinghtml  # NOQA
ModuleNotFoundError: No module named 'sphinxcontrib.serializinghtml'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 168, in decorator
    app = TestApp(*self.sphinxargs, **sphinxkwargs)
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 102, in __init__
    verbosity, parallel)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 240, in __init__
    self.setup_extension(extension)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 398, in setup_extension
    self.registry.load_extension(self, extname)
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 413, in load_extension
    err) from err
sphinx.errors.ExtensionError: Could not import extension sphinx.builders.epub3 (exception: No module named 'sphinxcontrib.serializinghtml')

======================================================================
ERROR: .. blockdiag::
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 409, in load_extension
    mod = import_module(extname)
  File "/usr/lib64/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/epub3.py", line 20, in <module>
    from sphinx.builders import _epub_base
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/_epub_base.py", line 25, in <module>
    from sphinx.builders.html import BuildInfo, StandaloneHTMLBuilder
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/html/__init__.py", line 1186, in <module>
    import sphinxcontrib.serializinghtml  # NOQA
ModuleNotFoundError: No module named 'sphinxcontrib.serializinghtml'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 168, in decorator
    app = TestApp(*self.sphinxargs, **sphinxkwargs)
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 102, in __init__
    verbosity, parallel)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 240, in __init__
    self.setup_extension(extension)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 398, in setup_extension
    self.registry.load_extension(self, extname)
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 413, in load_extension
    err) from err
sphinx.errors.ExtensionError: Could not import extension sphinx.builders.epub3 (exception: No module named 'sphinxcontrib.serializinghtml')

======================================================================
ERROR: .. blockdiag::
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 409, in load_extension
    mod = import_module(extname)
  File "/usr/lib64/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/epub3.py", line 20, in <module>
    from sphinx.builders import _epub_base
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/_epub_base.py", line 25, in <module>
    from sphinx.builders.html import BuildInfo, StandaloneHTMLBuilder
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/html/__init__.py", line 1186, in <module>
    import sphinxcontrib.serializinghtml  # NOQA
ModuleNotFoundError: No module named 'sphinxcontrib.serializinghtml'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 168, in decorator
    app = TestApp(*self.sphinxargs, **sphinxkwargs)
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 102, in __init__
    verbosity, parallel)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 240, in __init__
    self.setup_extension(extension)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 398, in setup_extension
    self.registry.load_extension(self, extname)
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 413, in load_extension
    err) from err
sphinx.errors.ExtensionError: Could not import extension sphinx.builders.epub3 (exception: No module named 'sphinxcontrib.serializinghtml')

======================================================================
ERROR: .. blockdiag::
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 409, in load_extension
    mod = import_module(extname)
  File "/usr/lib64/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/epub3.py", line 20, in <module>
    from sphinx.builders import _epub_base
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/_epub_base.py", line 25, in <module>
    from sphinx.builders.html import BuildInfo, StandaloneHTMLBuilder
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/html/__init__.py", line 1186, in <module>
    import sphinxcontrib.serializinghtml  # NOQA
ModuleNotFoundError: No module named 'sphinxcontrib.serializinghtml'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 168, in decorator
    app = TestApp(*self.sphinxargs, **sphinxkwargs)
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 102, in __init__
    verbosity, parallel)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 240, in __init__
    self.setup_extension(extension)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 398, in setup_extension
    self.registry.load_extension(self, extname)
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 413, in load_extension
    err) from err
sphinx.errors.ExtensionError: Could not import extension sphinx.builders.epub3 (exception: No module named 'sphinxcontrib.serializinghtml')

======================================================================
ERROR: .. blockdiag::
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 409, in load_extension
    mod = import_module(extname)
  File "/usr/lib64/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/epub3.py", line 20, in <module>
    from sphinx.builders import _epub_base
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/_epub_base.py", line 25, in <module>
    from sphinx.builders.html import BuildInfo, StandaloneHTMLBuilder
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/html/__init__.py", line 1186, in <module>
    import sphinxcontrib.serializinghtml  # NOQA
ModuleNotFoundError: No module named 'sphinxcontrib.serializinghtml'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 168, in decorator
    app = TestApp(*self.sphinxargs, **sphinxkwargs)
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 102, in __init__
    verbosity, parallel)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 240, in __init__
    self.setup_extension(extension)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 398, in setup_extension
    self.registry.load_extension(self, extname)
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 413, in load_extension
    err) from err
sphinx.errors.ExtensionError: Could not import extension sphinx.builders.epub3 (exception: No module named 'sphinxcontrib.serializinghtml')

======================================================================
ERROR: .. blockdiag::
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 409, in load_extension
    mod = import_module(extname)
  File "/usr/lib64/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/epub3.py", line 20, in <module>
    from sphinx.builders import _epub_base
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/_epub_base.py", line 25, in <module>
    from sphinx.builders.html import BuildInfo, StandaloneHTMLBuilder
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/html/__init__.py", line 1186, in <module>
    import sphinxcontrib.serializinghtml  # NOQA
ModuleNotFoundError: No module named 'sphinxcontrib.serializinghtml'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 168, in decorator
    app = TestApp(*self.sphinxargs, **sphinxkwargs)
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 102, in __init__
    verbosity, parallel)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 240, in __init__
    self.setup_extension(extension)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 398, in setup_extension
    self.registry.load_extension(self, extname)
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 413, in load_extension
    err) from err
sphinx.errors.ExtensionError: Could not import extension sphinx.builders.epub3 (exception: No module named 'sphinxcontrib.serializinghtml')

======================================================================
ERROR: .. blockdiag::
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 409, in load_extension
    mod = import_module(extname)
  File "/usr/lib64/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/epub3.py", line 20, in <module>
    from sphinx.builders import _epub_base
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/_epub_base.py", line 25, in <module>
    from sphinx.builders.html import BuildInfo, StandaloneHTMLBuilder
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/html/__init__.py", line 1186, in <module>
    import sphinxcontrib.serializinghtml  # NOQA
ModuleNotFoundError: No module named 'sphinxcontrib.serializinghtml'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 168, in decorator
    app = TestApp(*self.sphinxargs, **sphinxkwargs)
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 102, in __init__
    verbosity, parallel)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 240, in __init__
    self.setup_extension(extension)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 398, in setup_extension
    self.registry.load_extension(self, extname)
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 413, in load_extension
    err) from err
sphinx.errors.ExtensionError: Could not import extension sphinx.builders.epub3 (exception: No module named 'sphinxcontrib.serializinghtml')

======================================================================
ERROR: .. blockdiag::
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 409, in load_extension
    mod = import_module(extname)
  File "/usr/lib64/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/epub3.py", line 20, in <module>
    from sphinx.builders import _epub_base
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/_epub_base.py", line 25, in <module>
    from sphinx.builders.html import BuildInfo, StandaloneHTMLBuilder
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/html/__init__.py", line 1186, in <module>
    import sphinxcontrib.serializinghtml  # NOQA
ModuleNotFoundError: No module named 'sphinxcontrib.serializinghtml'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 168, in decorator
    app = TestApp(*self.sphinxargs, **sphinxkwargs)
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 102, in __init__
    verbosity, parallel)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 240, in __init__
    self.setup_extension(extension)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 398, in setup_extension
    self.registry.load_extension(self, extname)
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 413, in load_extension
    err) from err
sphinx.errors.ExtensionError: Could not import extension sphinx.builders.epub3 (exception: No module named 'sphinxcontrib.serializinghtml')

======================================================================
ERROR: .. blockdiag::
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 409, in load_extension
    mod = import_module(extname)
  File "/usr/lib64/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/epub3.py", line 20, in <module>
    from sphinx.builders import _epub_base
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/_epub_base.py", line 25, in <module>
    from sphinx.builders.html import BuildInfo, StandaloneHTMLBuilder
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/html/__init__.py", line 1186, in <module>
    import sphinxcontrib.serializinghtml  # NOQA
ModuleNotFoundError: No module named 'sphinxcontrib.serializinghtml'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 168, in decorator
    app = TestApp(*self.sphinxargs, **sphinxkwargs)
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 102, in __init__
    verbosity, parallel)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 240, in __init__
    self.setup_extension(extension)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 398, in setup_extension
    self.registry.load_extension(self, extname)
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 413, in load_extension
    err) from err
sphinx.errors.ExtensionError: Could not import extension sphinx.builders.epub3 (exception: No module named 'sphinxcontrib.serializinghtml')

======================================================================
ERROR: .. blockdiag::
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 409, in load_extension
    mod = import_module(extname)
  File "/usr/lib64/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/epub3.py", line 20, in <module>
    from sphinx.builders import _epub_base
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/_epub_base.py", line 25, in <module>
    from sphinx.builders.html import BuildInfo, StandaloneHTMLBuilder
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/html/__init__.py", line 1186, in <module>
    import sphinxcontrib.serializinghtml  # NOQA
ModuleNotFoundError: No module named 'sphinxcontrib.serializinghtml'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 168, in decorator
    app = TestApp(*self.sphinxargs, **sphinxkwargs)
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 102, in __init__
    verbosity, parallel)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 240, in __init__
    self.setup_extension(extension)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 398, in setup_extension
    self.registry.load_extension(self, extname)
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 413, in load_extension
    err) from err
sphinx.errors.ExtensionError: Could not import extension sphinx.builders.epub3 (exception: No module named 'sphinxcontrib.serializinghtml')

======================================================================
ERROR: .. blockdiag::
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 409, in load_extension
    mod = import_module(extname)
  File "/usr/lib64/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/epub3.py", line 20, in <module>
    from sphinx.builders import _epub_base
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/_epub_base.py", line 25, in <module>
    from sphinx.builders.html import BuildInfo, StandaloneHTMLBuilder
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/html/__init__.py", line 1186, in <module>
    import sphinxcontrib.serializinghtml  # NOQA
ModuleNotFoundError: No module named 'sphinxcontrib.serializinghtml'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 168, in decorator
    app = TestApp(*self.sphinxargs, **sphinxkwargs)
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 102, in __init__
    verbosity, parallel)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 240, in __init__
    self.setup_extension(extension)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 398, in setup_extension
    self.registry.load_extension(self, extname)
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 413, in load_extension
    err) from err
sphinx.errors.ExtensionError: Could not import extension sphinx.builders.epub3 (exception: No module named 'sphinxcontrib.serializinghtml')

======================================================================
ERROR: .. _target:
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 409, in load_extension
    mod = import_module(extname)
  File "/usr/lib64/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/epub3.py", line 20, in <module>
    from sphinx.builders import _epub_base
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/_epub_base.py", line 25, in <module>
    from sphinx.builders.html import BuildInfo, StandaloneHTMLBuilder
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/html/__init__.py", line 1186, in <module>
    import sphinxcontrib.serializinghtml  # NOQA
ModuleNotFoundError: No module named 'sphinxcontrib.serializinghtml'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 168, in decorator
    app = TestApp(*self.sphinxargs, **sphinxkwargs)
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 102, in __init__
    verbosity, parallel)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 240, in __init__
    self.setup_extension(extension)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 398, in setup_extension
    self.registry.load_extension(self, extname)
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 413, in load_extension
    err) from err
sphinx.errors.ExtensionError: Could not import extension sphinx.builders.epub3 (exception: No module named 'sphinxcontrib.serializinghtml')

======================================================================
ERROR: .. _hello world:
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 409, in load_extension
    mod = import_module(extname)
  File "/usr/lib64/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/epub3.py", line 20, in <module>
    from sphinx.builders import _epub_base
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/_epub_base.py", line 25, in <module>
    from sphinx.builders.html import BuildInfo, StandaloneHTMLBuilder
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/html/__init__.py", line 1186, in <module>
    import sphinxcontrib.serializinghtml  # NOQA
ModuleNotFoundError: No module named 'sphinxcontrib.serializinghtml'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 168, in decorator
    app = TestApp(*self.sphinxargs, **sphinxkwargs)
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 102, in __init__
    verbosity, parallel)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 240, in __init__
    self.setup_extension(extension)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 398, in setup_extension
    self.registry.load_extension(self, extname)
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 413, in load_extension
    err) from err
sphinx.errors.ExtensionError: Could not import extension sphinx.builders.epub3 (exception: No module named 'sphinxcontrib.serializinghtml')

======================================================================
ERROR: .. _target:
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 409, in load_extension
    mod = import_module(extname)
  File "/usr/lib64/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/epub3.py", line 20, in <module>
    from sphinx.builders import _epub_base
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/_epub_base.py", line 25, in <module>
    from sphinx.builders.html import BuildInfo, StandaloneHTMLBuilder
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/html/__init__.py", line 1186, in <module>
    import sphinxcontrib.serializinghtml  # NOQA
ModuleNotFoundError: No module named 'sphinxcontrib.serializinghtml'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 168, in decorator
    app = TestApp(*self.sphinxargs, **sphinxkwargs)
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 102, in __init__
    verbosity, parallel)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 240, in __init__
    self.setup_extension(extension)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 398, in setup_extension
    self.registry.load_extension(self, extname)
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 413, in load_extension
    err) from err
sphinx.errors.ExtensionError: Could not import extension sphinx.builders.epub3 (exception: No module named 'sphinxcontrib.serializinghtml')

======================================================================
ERROR: .. _hello world:
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 409, in load_extension
    mod = import_module(extname)
  File "/usr/lib64/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/epub3.py", line 20, in <module>
    from sphinx.builders import _epub_base
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/_epub_base.py", line 25, in <module>
    from sphinx.builders.html import BuildInfo, StandaloneHTMLBuilder
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/html/__init__.py", line 1186, in <module>
    import sphinxcontrib.serializinghtml  # NOQA
ModuleNotFoundError: No module named 'sphinxcontrib.serializinghtml'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 168, in decorator
    app = TestApp(*self.sphinxargs, **sphinxkwargs)
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 102, in __init__
    verbosity, parallel)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 240, in __init__
    self.setup_extension(extension)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 398, in setup_extension
    self.registry.load_extension(self, extname)
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 413, in load_extension
    err) from err
sphinx.errors.ExtensionError: Could not import extension sphinx.builders.epub3 (exception: No module named 'sphinxcontrib.serializinghtml')

======================================================================
ERROR: .. blockdiag::
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 409, in load_extension
    mod = import_module(extname)
  File "/usr/lib64/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/epub3.py", line 20, in <module>
    from sphinx.builders import _epub_base
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/_epub_base.py", line 25, in <module>
    from sphinx.builders.html import BuildInfo, StandaloneHTMLBuilder
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/html/__init__.py", line 1186, in <module>
    import sphinxcontrib.serializinghtml  # NOQA
ModuleNotFoundError: No module named 'sphinxcontrib.serializinghtml'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 168, in decorator
    app = TestApp(*self.sphinxargs, **sphinxkwargs)
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 102, in __init__
    verbosity, parallel)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 240, in __init__
    self.setup_extension(extension)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 398, in setup_extension
    self.registry.load_extension(self, extname)
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 413, in load_extension
    err) from err
sphinx.errors.ExtensionError: Could not import extension sphinx.builders.epub3 (exception: No module named 'sphinxcontrib.serializinghtml')

======================================================================
ERROR: .. blockdiag::
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 409, in load_extension
    mod = import_module(extname)
  File "/usr/lib64/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/epub3.py", line 20, in <module>
    from sphinx.builders import _epub_base
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/_epub_base.py", line 25, in <module>
    from sphinx.builders.html import BuildInfo, StandaloneHTMLBuilder
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/html/__init__.py", line 1186, in <module>
    import sphinxcontrib.serializinghtml  # NOQA
ModuleNotFoundError: No module named 'sphinxcontrib.serializinghtml'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 168, in decorator
    app = TestApp(*self.sphinxargs, **sphinxkwargs)
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 102, in __init__
    verbosity, parallel)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 240, in __init__
    self.setup_extension(extension)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 398, in setup_extension
    self.registry.load_extension(self, extname)
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 413, in load_extension
    err) from err
sphinx.errors.ExtensionError: Could not import extension sphinx.builders.epub3 (exception: No module named 'sphinxcontrib.serializinghtml')

======================================================================
ERROR: .. blockdiag::
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 409, in load_extension
    mod = import_module(extname)
  File "/usr/lib64/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/epub3.py", line 20, in <module>
    from sphinx.builders import _epub_base
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/_epub_base.py", line 25, in <module>
    from sphinx.builders.html import BuildInfo, StandaloneHTMLBuilder
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/html/__init__.py", line 1186, in <module>
    import sphinxcontrib.serializinghtml  # NOQA
ModuleNotFoundError: No module named 'sphinxcontrib.serializinghtml'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 168, in decorator
    app = TestApp(*self.sphinxargs, **sphinxkwargs)
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 102, in __init__
    verbosity, parallel)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 240, in __init__
    self.setup_extension(extension)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 398, in setup_extension
    self.registry.load_extension(self, extname)
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 413, in load_extension
    err) from err
sphinx.errors.ExtensionError: Could not import extension sphinx.builders.epub3 (exception: No module named 'sphinxcontrib.serializinghtml')

======================================================================
ERROR: .. blockdiag::
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 409, in load_extension
    mod = import_module(extname)
  File "/usr/lib64/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/epub3.py", line 20, in <module>
    from sphinx.builders import _epub_base
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/_epub_base.py", line 25, in <module>
    from sphinx.builders.html import BuildInfo, StandaloneHTMLBuilder
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/html/__init__.py", line 1186, in <module>
    import sphinxcontrib.serializinghtml  # NOQA
ModuleNotFoundError: No module named 'sphinxcontrib.serializinghtml'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 168, in decorator
    app = TestApp(*self.sphinxargs, **sphinxkwargs)
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 102, in __init__
    verbosity, parallel)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 240, in __init__
    self.setup_extension(extension)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 398, in setup_extension
    self.registry.load_extension(self, extname)
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 413, in load_extension
    err) from err
sphinx.errors.ExtensionError: Could not import extension sphinx.builders.epub3 (exception: No module named 'sphinxcontrib.serializinghtml')

======================================================================
ERROR: .. blockdiag::
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 409, in load_extension
    mod = import_module(extname)
  File "/usr/lib64/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/epub3.py", line 20, in <module>
    from sphinx.builders import _epub_base
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/_epub_base.py", line 25, in <module>
    from sphinx.builders.html import BuildInfo, StandaloneHTMLBuilder
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/html/__init__.py", line 1186, in <module>
    import sphinxcontrib.serializinghtml  # NOQA
ModuleNotFoundError: No module named 'sphinxcontrib.serializinghtml'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 168, in decorator
    app = TestApp(*self.sphinxargs, **sphinxkwargs)
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 102, in __init__
    verbosity, parallel)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 240, in __init__
    self.setup_extension(extension)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 398, in setup_extension
    self.registry.load_extension(self, extname)
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 413, in load_extension
    err) from err
sphinx.errors.ExtensionError: Could not import extension sphinx.builders.epub3 (exception: No module named 'sphinxcontrib.serializinghtml')

======================================================================
ERROR: .. blockdiag::
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 409, in load_extension
    mod = import_module(extname)
  File "/usr/lib64/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/epub3.py", line 20, in <module>
    from sphinx.builders import _epub_base
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/_epub_base.py", line 25, in <module>
    from sphinx.builders.html import BuildInfo, StandaloneHTMLBuilder
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/html/__init__.py", line 1186, in <module>
    import sphinxcontrib.serializinghtml  # NOQA
ModuleNotFoundError: No module named 'sphinxcontrib.serializinghtml'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 168, in decorator
    app = TestApp(*self.sphinxargs, **sphinxkwargs)
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 102, in __init__
    verbosity, parallel)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 240, in __init__
    self.setup_extension(extension)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 398, in setup_extension
    self.registry.load_extension(self, extname)
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 413, in load_extension
    err) from err
sphinx.errors.ExtensionError: Could not import extension sphinx.builders.epub3 (exception: No module named 'sphinxcontrib.serializinghtml')

======================================================================
ERROR: .. blockdiag::
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 409, in load_extension
    mod = import_module(extname)
  File "/usr/lib64/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/epub3.py", line 20, in <module>
    from sphinx.builders import _epub_base
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/_epub_base.py", line 25, in <module>
    from sphinx.builders.html import BuildInfo, StandaloneHTMLBuilder
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/html/__init__.py", line 1186, in <module>
    import sphinxcontrib.serializinghtml  # NOQA
ModuleNotFoundError: No module named 'sphinxcontrib.serializinghtml'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 168, in decorator
    app = TestApp(*self.sphinxargs, **sphinxkwargs)
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 102, in __init__
    verbosity, parallel)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 240, in __init__
    self.setup_extension(extension)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 398, in setup_extension
    self.registry.load_extension(self, extname)
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 413, in load_extension
    err) from err
sphinx.errors.ExtensionError: Could not import extension sphinx.builders.epub3 (exception: No module named 'sphinxcontrib.serializinghtml')

======================================================================
ERROR: .. blockdiag::
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 409, in load_extension
    mod = import_module(extname)
  File "/usr/lib64/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/epub3.py", line 20, in <module>
    from sphinx.builders import _epub_base
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/_epub_base.py", line 25, in <module>
    from sphinx.builders.html import BuildInfo, StandaloneHTMLBuilder
  File "/usr/lib64/python3.6/site-packages/sphinx/builders/html/__init__.py", line 1186, in <module>
    import sphinxcontrib.serializinghtml  # NOQA
ModuleNotFoundError: No module named 'sphinxcontrib.serializinghtml'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 168, in decorator
    app = TestApp(*self.sphinxargs, **sphinxkwargs)
  File "/usr/lib64/python3.6/site-packages/sphinx_testing/util.py", line 102, in __init__
    verbosity, parallel)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 240, in __init__
    self.setup_extension(extension)
  File "/usr/lib64/python3.6/site-packages/sphinx/application.py", line 398, in setup_extension
    self.registry.load_extension(self, extname)
  File "/usr/lib64/python3.6/site-packages/sphinx/registry.py", line 413, in load_extension
    err) from err
sphinx.errors.ExtensionError: Could not import extension sphinx.builders.epub3 (exception: No module named 'sphinxcontrib.serializinghtml')

----------------------------------------------------------------------
Ran 37 tests in 0.478s

FAILED (errors=37)
 * ERROR: dev-python/sphinxcontrib-blockdiag-2.0.0-r1::gentoo failed (test phase):
 *   Tests fail with python3.6
 * 
 * Call stack:
 *     ebuild.sh, line  125:  Called src_test
 *   environment, line 3112:  Called distutils-r1_src_test
 *   environment, line 1302:  Called _distutils-r1_run_foreach_impl 'python_test'
 *   environment, line  518:  Called python_foreach_impl 'distutils-r1_run_phase' 'python_test'
 *   environment, line 2710:  Called multibuild_foreach_variant '_python_multibuild_wrapper' 'distutils-r1_run_phase' 'python_test'
 *   environment, line 2142:  Called _multibuild_run '_python_multibuild_wrapper' 'distutils-r1_run_phase' 'python_test'
 *   environment, line 2140:  Called _python_multibuild_wrapper 'distutils-r1_run_phase' 'python_test'
 *   environment, line  875:  Called distutils-r1_run_phase 'python_test'
 *   environment, line 1239:  Called python_test
 *   environment, line 3072:  Called die
 * The specific snippet of code:
 *       nosetests -v || die "Tests fail with ${EPYTHON}"
 * 
 * If you need support, post the output of `emerge --info '=dev-python/sphinxcontrib-blockdiag-2.0.0-r1::gentoo'`,
 * the complete build log and the output of `emerge -pqv '=dev-python/sphinxcontrib-blockdiag-2.0.0-r1::gentoo'`.
 * The complete build log is located at '/var/log/emerge-log/build/dev-python/sphinxcontrib-blockdiag-2.0.0-r1:20201203-220440.log'.
 * For convenience, a symlink to the build log is located at '/var/tmp/portage/dev-python/sphinxcontrib-blockdiag-2.0.0-r1/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/dev-python/sphinxcontrib-blockdiag-2.0.0-r1/temp/environment'.
 * Working directory: '/var/tmp/portage/dev-python/sphinxcontrib-blockdiag-2.0.0-r1/work/sphinxcontrib-blockdiag-2.0.0'
 * S: '/var/tmp/portage/dev-python/sphinxcontrib-blockdiag-2.0.0-r1/work/sphinxcontrib-blockdiag-2.0.0'