# Sphinx version: 1.8.5
# Python version: 3.7.4 (CPython)
# Docutils version: 0.14 
# Jinja2 version: 2.10.1
# Last messages:
#   writing output... [ 78%] index
#   writing output... [ 84%] install
#   writing output... [ 89%] latex_citations
#   writing output... [ 94%] nbconvert_library
#   writing output... [100%] usage
#   
#   generating indices...
#   genindex
#   py-modindex
#   
# Loaded extensions:
#   sphinx.ext.mathjax (1.8.5) from /usr/lib/python3.7/site-packages/sphinx/ext/mathjax.py
#   alabaster (0.7.11) from /usr/lib/python3.7/site-packages/alabaster/__init__.py
#   sphinx.ext.autodoc (1.8.5) from /usr/lib/python3.7/site-packages/sphinx/ext/autodoc/__init__.py
#   sphinx.ext.napoleon (1.8.5) from /usr/lib/python3.7/site-packages/sphinx/ext/napoleon/__init__.py
#   nbsphinx (0.2.14) from /usr/lib/python3.7/site-packages/nbsphinx.py
#   IPython.sphinxext.ipython_console_highlighting (unknown version) from /usr/lib/python3.7/site-packages/IPython/sphinxext/ipython_console_highlighting.py
Traceback (most recent call last):
  File "/usr/lib/python3.7/site-packages/sphinx/cmd/build.py", line 304, in build_main
    app.build(args.force_all, filenames)
  File "/usr/lib/python3.7/site-packages/sphinx/application.py", line 341, in build
    self.builder.build_update()
  File "/usr/lib/python3.7/site-packages/sphinx/builders/__init__.py", line 347, in build_update
    len(to_build))
  File "/usr/lib/python3.7/site-packages/sphinx/builders/__init__.py", line 415, in build
    self.finish()
  File "/usr/lib/python3.7/site-packages/sphinx/builders/html.py", line 750, in finish
    self.finish_tasks.add_task(self.gen_additional_pages)
  File "/usr/lib/python3.7/site-packages/sphinx/util/parallel.py", line 51, in add_task
    res = task_func()
  File "/usr/lib/python3.7/site-packages/sphinx/builders/html.py", line 776, in gen_additional_pages
    for pagelist in self.app.emit('html-collect-pages'):
  File "/usr/lib/python3.7/site-packages/sphinx/application.py", line 510, in emit
    return self.events.emit(event, self, *args)
  File "/usr/lib/python3.7/site-packages/sphinx/events.py", line 80, in emit
    results.append(callback(*args))
  File "/usr/lib/python3.7/site-packages/nbsphinx.py", line 1177, in html_collect_pages
    for file in app.status_iterator(files, 'copying linked files... ',
AttributeError: 'Sphinx' object has no attribute 'status_iterator'