DjangoAdmin Error from http://stackoverflow.com/q/1033443/49

Environment:

Request Method: GET
Request URL: http://127.0.0.1:8000/admin/
Django Version: 1.0.4
Python Version: 2.7.1
Installed Applications:
['django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.sites',
 'django.contrib.humanize',
 'pinax.templatetags',
 'notification',
 'django_openid',
 'emailconfirmation',
 'mailer',
 'announcements',
 'pagination',
 'timezones',
 'ajax_validation',
 'uni_form',
 'staticfiles',
 'basic_profiles',
 'account',
 'signup_codes',
 'about',
 'django.contrib.admin',
 'PinaxFeedPaper.apps.FeedPaper']
Installed Middleware:
('django.middleware.common.CommonMiddleware',
 'django.contrib.sessions.middleware.SessionMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django_openid.consumer.SessionConsumer',
 'account.middleware.LocaleMiddleware',
 'django.middleware.doc.XViewMiddleware',
 'pagination.middleware.PaginationMiddleware',
 'pinax.middleware.security.HideSensistiveFieldsMiddleware')


Traceback:
File "/home/gautam/.virtualenvs/pinax-env/local/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response
  82.                     request.path_info)
File "/home/gautam/.virtualenvs/pinax-env/local/lib/python2.7/site-packages/django/core/urlresolvers.py" in resolve
  181.             for pattern in self.urlconf_module.urlpatterns:
File "/home/gautam/.virtualenvs/pinax-env/local/lib/python2.7/site-packages/django/core/urlresolvers.py" in _get_urlconf_module
  205.             self._urlconf_module = __import__(self.urlconf_name, {}, {}, [''])
File "/home/gautam/Aptana Studio 3 Workspace/Topic Pages/topicpages/G/PinaxFeedPaper/../PinaxFeedPaper/urls.py" in <module>
  7. admin.autodiscover()
File "/home/gautam/.virtualenvs/pinax-env/local/lib/python2.7/site-packages/django/contrib/admin/__init__.py" in autodiscover
  54.         __import__("%s.admin" % app)
File "/home/gautam/Aptana Studio 3 Workspace/Topic Pages/topicpages/G/PinaxFeedPaper/../PinaxFeedPaper/apps/FeedPaper/admin.py" in <module>
  24. admin.site.register( RSSFeed , Admin_RSSFeed )
File "/home/gautam/.virtualenvs/pinax-env/local/lib/python2.7/site-packages/django/contrib/admin/sites.py" in register
  77.             validate(admin_class, model)
File "/home/gautam/.virtualenvs/pinax-env/local/lib/python2.7/site-packages/django/contrib/admin/validation.py" in validate
  25.     validate_base(cls, model)
File "/home/gautam/.virtualenvs/pinax-env/local/lib/python2.7/site-packages/django/contrib/admin/validation.py" in validate_base
  166.             check_formfield(cls, model, opts, 'fields', field)
File "/home/gautam/.virtualenvs/pinax-env/local/lib/python2.7/site-packages/django/contrib/admin/validation.py" in check_formfield
  271.                 "is missing from the form." % (cls.__name__, label, field))

Exception Type: ImproperlyConfigured at /admin/
Exception Value: 'Admin_RSSFeed.fields' refers to field 'created_at' that is missing from the form.