admin.autodiscover（）在urls.py类中抛出TypeError

我知道如何解决 . 我最近将我的Ubuntu升级到14.04（显然也升级了我的Python），当我在urls.py文件中取消注释 admin.autodiscover() 方法时，Django开始抛出TypeError . 当我评论它，该网站工作正常，但是，我失去了管理员访问权限，从管理界面编辑任何东西 . 回溯和要求如下 . 谢谢！

追溯

File "/home/bram/.virtualenvs/viso_project/local/lib/python2.7/site- packages/django/core/handlers/base.py" in get_response
    99.                 resolver_match = resolver.resolve(request.path_info)
    File "/home/bram/.virtualenvs/viso_project/local/lib/python2.7/site-packages/django/core/urlresolvers.py" in resolve
    337.             for pattern in self.url_patterns:
    File "/home/bram/.virtualenvs/viso_project/local/lib/python2.7/site-packages/django/core/urlresolvers.py" in url_patterns
    365.         patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module)
    File "/home/bram/.virtualenvs/viso_project/local/lib/python2.7/site-packages/django/core/urlresolvers.py" in urlconf_module
    360.             self._urlconf_module = import_module(self.urlconf_name)
    File "/home/bram/.virtualenvs/viso_project/local/lib/python2.7/site-packages/django/utils/importlib.py" in import_module
    40.         __import__(name)
    File "/home/bram/Code/Dropbox/viso_project/viso_project/urls.py" in <module>
    7. admin.autodiscover() 
    File "/home/bram/.virtualenvs/viso_project/local/lib/python2.7/site-packages/django/contrib/admin/__init__.py" in autodiscover
    29.             import_module('%s.admin' % app)
    File "/home/bram/.virtualenvs/viso_project/local/lib/python2.7/site-packages/django/utils/importlib.py" in import_module
    40.         __import__(name)
    File "/home/bram/Code/Dropbox/viso_project/sa_programs/admin.py" in <module>
    55. admin.site.register(UserProfile, UserProfileAdmin)
    File "/home/bram/.virtualenvs/viso_project/local/lib/python2.7/site-packages/django/contrib/admin/sites.py" in register
    92.                     admin_class.validate(model)
    File "/home/bram/.virtualenvs/viso_project/local/lib/python2.7/site-packages/django/contrib/admin/options.py" in validate
    106.         validator.validate(cls, model)
    File "/home/bram/.virtualenvs/viso_project/local/lib/python2.7/site-packages/django/contrib/admin/validation.py" in validate
    25.                 getattr(self, m)(cls, model)
    File "/home/bram/.virtualenvs/viso_project/local/lib/python2.7/site-packages/django/contrib/admin/validation.py" in validate_inlines
    224.                 if not issubclass(inline.model, models.Model):

要求

Django==1.6.5
    Fabric==1.9.0
    South==1.0
    argparse==1.2.1
    distribute==0.6.24
    django-appconf==0.6
    django-bootstrap-form==3.1
    django-crispy-forms==1.4.0
    django-forms-bootstrap==3.0.0
    django-user-accounts==1.0c9
    ecdsa==0.11
    paramiko==1.14.0
    pinax-theme-bootstrap==5.4.0
    pinax-theme-bootstrap-account==1.0b2
    pycrypto==2.6.1
    pytz==2014.4
    six==1.7.3
    wsgiref==0.1.2

异常类型：TypeError at / admin / Exception值：issubclass（）arg 1必须是一个类