Django ValueError at /admin/

Question

I am running Django with mod_python on a Red Hat Linux box in production. A little while ago, for a reason unknown to me, the admin stopped working, throwing a 500 error. The error is as follows:

ValueError at /admin/
Empty module name
Request Method: GET
Exception Type: ValueError
Exception Value: 
Empty module name
Exception Location: /usr/local/lib/python2.6/site-packages/django/utils/importlib.py in import_module, line 35
Python Executable: /usr/bin/python
Python Version: 2.6.2

Has anyone encountered this before? I have absolutely no idea how to fix this problem.

Thank you for any help.

- Is the value error occurring in when you access /admin/ or a sub page of that? - Have you entered any new data into the admin app? (Maybe imported data from using a python script)? - What DB are you using? - Can you paste the entire traceback in djangosnippets or something similar — ismail
– ismail, Commented Nov 19, 2009 at 11:14
It occurs when I access /admin/. The admin panel has not had anything new added to it. The database is MySQL. I'll post the traceback. — mjaz
– mjaz, Commented Nov 20, 2009 at 2:42

Joe Germuska · Accepted Answer · 2010-05-10 23:32:00Z

I was just debugging this problem. The error arises when Django is attempting to set up the template context processors, and the root cause was a definition which should have been a tuple but was actually a string.

This is what I had in my config file:

TEMPLATE_CONTEXT_PROCESSORS = (
'django.core.context_processors.auth'
)

This is what I should have had:

TEMPLATE_CONTEXT_PROCESSORS = (
'django.core.context_processors.auth',
)

Without the trailing comma, Python treats the value of the variable as a string. Thus, Django code which looks like this:

for path in settings.TEMPLATE_CONTEXT_PROCESSORS:
    i = path.rfind('.')
    module,attr = path[:i],path[i+1:]

the first value of 'path' is 'd', not 'django.core.context_processors.auth'. This leads the value of 'i' to be -1 and thus the value of 'module' to be empty.

Make sure that all of the tuple-like things in your Django config are actually tuples, which means if they have a single value, they still need a trailing comma.

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