Traceback of crash after starting Picard

picard-crash-oo_84aw2.log (text/x-log), 779 bytes, created by Laurens H. on 2021-12-22 15:29:39 UTC

Traceback (most recent call last):
  File "/usr/bin/picard", line 4, in <module>
    from picard.tagger import main
  File "/usr/lib/python3.9/site-packages/picard/tagger.py", line 64, in <module>
    from picard import (
  File "/usr/lib/python3.9/site-packages/picard/acoustid/__init__.py", line 39, in <module>
    from picard.file import File
  File "/usr/lib/python3.9/site-packages/picard/file.py", line 74, in <module>
    from picard.script import get_file_naming_script
  File "/usr/lib/python3.9/site-packages/picard/script/__init__.py", line 63, in <module>
    from picard.script.serializer import FileNamingScript
  File "/usr/lib/python3.9/site-packages/picard/script/serializer.py", line 33, in <module>
    import yaml
ModuleNotFoundError: No module named 'yaml'