'NoneType' object has no attribute '__getitem__' Please help me to debug this

[Ham Kibz]

Below is the traceback

Django Version: 1.5.1
Python Version: 2.7.4
Installed Applications:
('django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.sites',
 'django.contrib.messages',
 'django.contrib.staticfiles',
 'django.contrib.admin',
 'products')
Installed Middleware:
('django.middleware.common.CommonMiddleware',
 'django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware')


Traceback:
File 
"/home/kelcy/django1.5.1/local/lib/python2.7/site-packages/django/core/handlers/base.py"
 
in get_response
  115. response = callback(request, *callback_args, 
**callback_kwargs)
File 
"/home/kelcy/django1.5.1/local/lib/python2.7/site-packages/django/contrib/admin/options.py"
 
in wrapper
  372. return self.admin_site.admin_view(view)(*args, 
**kwargs)
File 
"/home/kelcy/django1.5.1/local/lib/python2.7/site-packages/django/utils/decorators.py"
 
in _wrapped_view
  91. response = view_func(request, *args, **kwargs)
File 
"/home/kelcy/django1.5.1/local/lib/python2.7/site-packages/django/views/decorators/cache.py"
 
in _wrapped_view_func
  89. response = view_func(request, *args, **kwargs)
File 
"/home/kelcy/django1.5.1/local/lib/python2.7/site-packages/django/contrib/admin/sites.py"
 
in inner
  202. return view(request, *args, **kwargs)
File 
"/home/kelcy/django1.5.1/local/lib/python2.7/site-packages/django/utils/decorators.py"
 
in _wrapper
  25. return bound_func(*args, **kwargs)
File 
"/home/kelcy/django1.5.1/local/lib/python2.7/site-packages/django/utils/decorators.py"
 
in _wrapped_view
  91. response = view_func(request, *args, **kwargs)
File 
"/home/kelcy/django1.5.1/local/lib/python2.7/site-packages/django/utils/decorators.py"
 
in bound_func
  21. return func(self, *args2, **kwargs2)
File 
"/home/kelcy/django1.5.1/local/lib/python2.7/site-packages/django/db/transaction.py"
 
in inner
  223. return func(*args, **kwargs)
File 
"/home/kelcy/django1.5.1/local/lib/python2.7/site-packages/django/contrib/admin/options.py"
 
in add_view
  1009. self.log_addition(request, new_object)
File 
"/home/kelcy/django1.5.1/local/lib/python2.7/site-packages/django/contrib/admin/options.py"
 
in log_addition
  530. action_flag = ADDITION
File 
"/home/kelcy/django1.5.1/local/lib/python2.7/site-packages/django/contrib/admin/models.py"
 
in log_action
  18. e = self.model(None, None, user_id, content_type_id, 
smart_text(object_id), object_repr[:200], action_flag, change_message)

Exception Type: TypeError at /admin/products/catalogcategory/add/
Exception Value: 'NoneType' object has no attribute '__getitem__'

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Override default fields in ModelForm

[Ham Kibz]

Here is the link to the 
question 
http://stackoverflow.com/questions/36124194/how-do-i-override-a-modelform-fields-attribute?noredirect=1#comment59888797_36124194


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