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Document ImportError on case unaware file systems. #868

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May 24, 2017
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Document ImportError on case unaware file systems. #868

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32 changes: 32 additions & 0 deletions manage/troubleshooting/exceptions.rst
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Expand Up @@ -2147,3 +2147,35 @@ This enables ``z3c.form`` widgets on a Plone site.
**Solution**: *portal_setup* > *Import*. Choose profile *Plone z3cform support*.
and import. The layer gets properly inserted to your site database.


ImportError: cannot import name datetime
----------------------------------------

**Traceback**::

(zinstance) [vagrant@dev Plone-5.0.7]$ ./zinstance/bin/plonectl start
instance: Traceback (most recent call last):
File "/home/vagrant/src/Plone-5.0.7/zinstance/bin/instance", line 259, in <module>
import plone.recipe.zope2instance.ctl
File "/home/vagrant/src/Plone-5.0.7/buildout-cache/eggs/plone.recipe.zope2instance-4.2.22-py2.7.egg/plone/__init__.py", line 2, in <module>
__import__('pkg_resources').declare_namespace(__name__)
File "/home/vagrant/src/Plone-5.0.7/zinstance/lib/python2.7/site-packages/pkg_resources/__init__.py", line 35, in <module>
import plistlib
File "/usr/lib64/python2.7/plistlib.py", line 62, in <module>
import datetime
File "/home/vagrant/src/Plone-5.0.7/buildout-cache/eggs/DateTime-4.0.1-py2.7.egg/datetime/__init__.py", line 14, in <module>
from .DateTime import DateTime
File "/home/vagrant/src/Plone-5.0.7/buildout-cache/eggs/DateTime-4.0.1-py2.7.egg/datetime/DateTime.py", line 24, in <module>
from datetime import datetime
File "/home/vagrant/src/Plone-5.0.7/buildout-cache/eggs/DateTime-4.0.1-py2.7.egg/datetime/datetime.py", line 24, in <module>
from datetime import datetime
ImportError: cannot import name datetime

**Reason**: You are running Plone in a virtual machine (docker, vagrant) on a case sensitive (or rather case unaware) file system (Mac OSX).
The system is getting confused between ``DateTime`` and ``datetime`` because it gets the wrong information from the host system.

**Solution**: Make sure you are not using shared folders that get written to by both systems.
Or at least do not put packages there.

.. seealso::
https://community.plone.org/t/plone-5-0-7-unifiedinstaller-importerror-issue/3986