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Django: Queryset object has no attribute '_prefetch_related_lookups'

After migrating an app from Django 1.3 to 1.4 and testing that all worked fine locally, I ran into this message while updating the server:

Queryset object has no attribute '_prefetch_related_lookups'

The problem is the Sessions, I had to delete them all for it to work. Addtionally I changed the settings SECRET_KEY so all sessions don't validate.

This is the related Django ticket