EntryAdmin.form does not inherit from BaseModelForm.

Hello,

I'm having a strange issue where I get the following exception on my production server, but have no issues on my dev machine:

Django Version:	1.3.1
Exception Type:	ImproperlyConfigured
Exception Value:	EntryAdmin.form does not inherit from BaseModelForm.
Exception Location:	/home/cjfox/webapps/django_1_3_1/starship/django/contrib/admin/validation.py in validate_base, line 292
Python Executable:	/usr/local/bin/python
Python Version:	2.7.3

I have narrowed the problem down to this area of the code:

class EntryAdminForm(forms.ModelForm):

class Meta:

model = Entry

latitude = CoordinateField()

longitude = CoordinateField()

class EntryAdmin(admin.ModelAdmin):

form = EntryAdminForm      ## COMMENT OUT THIS LINE MAKES THE PRODUCTION SERVER WORK ##

list_display = ('title', 'location', 'pub_date', 'type', 'blogger')

list_filter = ('blogger', 'pub_date', 'type')

I have hit a wall with this one and could use some inspiration. 

As mentioned above commenting out form = EntryAdminForm in EntryAdmin makes everything work fine

Below is more details on the error:

Environment:

Request Method: GET

Request URL: http://URL/admin/sail_blog/entry/120/

Django Version: 1.3.1

Python Version: 2.7.3

Installed Applications:

['django.contrib.auth',

 'django.contrib.contenttypes',

 'django.contrib.sessions',

 'django.contrib.sites',

 'django.contrib.messages',

 'django.contrib.staticfiles',

 'django.contrib.admin',

 'sail_blog',

 'blog_redirect']

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/cjfox/webapps/django_1_3_1/starship/django/core/handlers/base.py" in get_response

  101.                             request.path_info)

File "/home/cjfox/webapps/django_1_3_1/starship/django/core/urlresolvers.py" in resolve

  250.             for pattern in self.url_patterns:

File "/home/cjfox/webapps/django_1_3_1/starship/django/core/urlresolvers.py" in _get_url_patterns

  279.         patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module)

File "/home/cjfox/webapps/django_1_3_1/starship/django/core/urlresolvers.py" in _get_urlconf_module

  274.             self._urlconf_module = import_module(self.urlconf_name)

File "/home/cjfox/webapps/django_1_3_1/starship/django/utils/importlib.py" in import_module

  35.     __import__(name)

File "/home/cjfox/webapps/django_1_3_1/starship/urls.py" in <module>

  5. admin.autodiscover()

File "/home/cjfox/webapps/django_1_3_1/starship/django/contrib/admin/__init__.py" in autodiscover

  26.             import_module('%s.admin' % app)

File "/home/cjfox/webapps/django_1_3_1/starship/django/utils/importlib.py" in import_module

  35.     __import__(name)

File "/home/cjfox/webapps/django_1_3_1/starship/sail_blog/admin.py" in <module>

  45. admin.site.register(Entry, EntryAdmin)

File "/home/cjfox/webapps/django_1_3_1/starship/django/contrib/admin/sites.py" in register

  97.             validate(admin_class, model)

File "/home/cjfox/webapps/django_1_3_1/starship/django/contrib/admin/validation.py" in validate

  24.     validate_base(cls, model)

File "/home/cjfox/webapps/django_1_3_1/starship/django/contrib/admin/validation.py" in validate_base

  292.                 "BaseModelForm." % cls.__name__)

Exception Type: ImproperlyConfigured at /admin/sail_blog/entry/120/

Exception Value: EntryAdmin.form does not inherit from BaseModelForm.

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