Django Newbie Question (Exception Type: TypeError, Value: argument of type 'NoneType' is not iterable)

Hi All,

I am somewhat new to Django, although I have been programming in
Python for a while. I installed Pinax and have been working on a site
from one of the starter templates, and have an error I can't seem to
wrap my head around.

Exception Type: TypeError at /models/add
Exception Value: argument of type 'NoneType' is not iterable
Exception Location: /Users/ab/Desktop/mysite/lib/python2.6/site-
packages/django/forms/models.py in construct_instance, line 40

Here is the traceback:
Traceback:
File "/Users/ab/Desktop/mysite/lib/python2.6/site-packages/django/core/
handlers/base.py" in get_response
100. response = callback(request,
*callback_args, **callback_kwargs)
File "/Users/ab/Desktop/mysite/lib/python2.6/site-packages/django/
contrib/auth/decorators.py" in _wrapped_view
25. return view_func(request, *args, **kwargs)
File "/Users/ab/Desktop/store/models/views.py" in add_model
65. if formtoaddmodel.is_valid():
File "/Users/ab/Desktop/mysite/lib/python2.6/site-packages/django/
forms/forms.py" in is_valid
121. return self.is_bound and not bool(self.errors)
File "/Users/ab/Desktop/mysite/lib/python2.6/site-packages/django/
forms/forms.py" in _get_errors
112. self.full_clean()
File "/Users/ab/Desktop/mysite/lib/python2.6/site-packages/django/
forms/forms.py" in full_clean
269. self._post_clean()
File "/Users/ab/Desktop/mysite/lib/python2.6/site-packages/django/
forms/models.py" in _post_clean
316. self.instance = construct_instance(self, self.instance,
opts.fields, opts.exclude)
File "/Users/ab/Desktop/mysite/lib/python2.6/site-packages/django/
forms/models.py" in construct_instance
40. or not f.name in cleaned_data:

Any hints on why this is occurring? Or at least hints on where to
start?

Thanks!

-Alexandra

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