Extending User model with Inheritance - Attribute Error

Hi all,

I am attempting to follow this tutorial:
http://scottbarnham.com/blog/2008/08/21/extending-the-django-user-model-with-inheritance/

But I am receiving this error:
AttributeError at /login/
'NoneType' object has no attribute 'DoesNotExist'

Here is my stack trace:
http://dpaste.com/565795/

I tried changing the CUSTOM_USER_MODEL field to every permutation of
paths that could possibly lead to my CustomUser class, but they all
gave the same error.

Thanks in advance.

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