Comment #5 on issue 3932 by chip...@gmail.com: ValueError:
Extension "__builtin__.NoneType" must be of type: "markdown.Extension".
If you downgrade, you must restore to a database from before the upgrade,
or you're going to hit versioning problems later when upgrading again.
It is an easy_install problem. That version is very old. You can update it
sudo easy_install -U setuptools
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