'module' object has no attribute 'GenericForeignKey'
I jumped into Trac and noticed that just yesterday some things were rearranged. In short, if you are using generic relations, you'll need to change two parts of your code. First, the generic relations field must be imported out of conttenttype.
from django.contrib.contenttypes import generic
And second, you'll need to change the 'location prefix' (for lack of a better description:
From:
generic_field = models.GenericRelation(SomeOtherModel)
To:
generic_field = generic.GenericRelation(SomeOtherModel)
All should be find from there on out. For more information, take a look at the reference wiki article.