AlreadyRegistered Error

[Oussama Mubarak]

When running "python manage.py test" with Django 1.2.1, I get the following error in each test:

...
File "/usr/lib/pymodules/python2.6/django/contrib/admin/__init__.py", line 24, in autodiscover
    import_module('%s.admin' % app)
  File "/usr/lib/pymodules/python2.6/django/utils/importlib.py", line 35, in import_module
    __import__(name)
  File "/var/www/games/semiaddict/server/django_openid_auth/admin.py", line 46, in <module>
    admin.site.register(Nonce, NonceAdmin)
  File "/usr/lib/pymodules/python2.6/django/contrib/admin/sites.py", line 78, in register
    raise AlreadyRegistered('The model %s is already registered' % model.__name__)
AlreadyRegistered: The model Nonce is already registered

Strangely, this doesn't occur when I test my applications one at a time.