Module “django.core.context_processors” does not define a “auth” callable request processor

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It looks like you have upgraded to Django 1.4 or later.

The auth context processor has been moved from django.core.context_processors.auth to django.contrib.auth.context_processors.auth. The move started in Django 1.2, and django.core.context_processors.auth was completely removed in Django 1.4.

I recommend you run the same version of Django on your dev and production environments to prevent errors like this.

When you upgrade to Django 1.4, you need to make the following change to TEMPLATE_CONTEXT_PROCESSORS in your settings file:

# old
TEMPLATE_CONTEXT_PROCESSORS = ("django.core.context_processors.auth",
                               ...
)
# new
TEMPLATE_CONTEXT_PROCESSORS = ("django.contrib.auth.context_processors.auth",
                               ...
)

When migrating, the release notes (1.2, 1.3, 1.4) are useful for catching changes like this.

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