Traceback (most recent call last):
File "/home/travis/build/garenchan/werkzeug/.tox/docs-html/lib/python3.6/site-packages/sphinx/config.py", line 157, in __init__
execfile_(filename, config)
File "/home/travis/build/garenchan/werkzeug/.tox/docs-html/lib/python3.6/site-packages/sphinx/util/pycompat.py", line 150, in execfile_
exec_(code, _globals)
File "conf.py", line 2, in <module>
from pallets_sphinx_themes import ProjectLink, get_version
File "/home/travis/build/garenchan/werkzeug/.tox/docs-html/lib/python3.6/site-packages/pallets_sphinx_themes/__init__.py", line 15, in <module>
from .versions import load_versions
File "/home/travis/build/garenchan/werkzeug/.tox/docs-html/lib/python3.6/site-packages/pallets_sphinx_themes/versions.py", line 7, in <module>
from packaging import version as pv
ModuleNotFoundError: No module named 'packaging'