u'rest_framework'不是注册名称p

Question

我试图使用Django Rest框架进行身份验证，但无法通过DRF面板登录。当我试图通过指定

/api/api认证/登录/

NoReverseMatch at /api/api-auth/login/
u'rest_framework' is not a registered namespace
Request Method: GET
Request URL:    http://127.0.0.1:8000/api/api-auth/login/
Django Version: 1.7.1
Exception Type: NoReverseMatch
Exception Value:    
u'rest_framework' is not a registered namespace
Exception Location: /home/shivani/aubergine_cubii/test_rest_api2/forked_rest_api/venv/local/lib/python2.7/site-packages/django/core/urlresolvers.py in reverse, line 547
Python Executable:  /home/shivani/aubergine_cubii/test_rest_api2/forked_rest_api/venv/bin/python
Python Version: 2.7.8
Python Path:    
['/home/shivani/aubergine_cubii/test_rest_api2/forked_rest_api',
 '/home/shivani/aubergine_cubii/test_rest_api2/forked_rest_api/venv/lib/python2.7',
 '/home/shivani/aubergine_cubii/test_rest_api2/forked_rest_api/venv/lib/python2.7/plat-x86_64-linux-gnu',
 '/home/shivani/aubergine_cubii/test_rest_api2/forked_rest_api/venv/lib/python2.7/lib-tk',
 '/home/shivani/aubergine_cubii/test_rest_api2/forked_rest_api/venv/lib/python2.7/lib-old',
 '/home/shivani/aubergine_cubii/test_rest_api2/forked_rest_api/venv/lib/python2.7/lib-dynload',
 '/usr/lib/python2.7',
 '/usr/lib/python2.7/plat-x86_64-linux-gnu',
 '/usr/lib/python2.7/lib-tk',
 '/home/shivani/aubergine_cubii/test_rest_api2/forked_rest_api/venv/local/lib/python2.7/site-packages',
 '/home/shivani/aubergine_cubii/test_rest_api2/forked_rest_api/venv/lib/python2.7/site-packages']
Server time:    Tue, 20 Jan 2015 10:52:13 +0000

url.py

urlpatterns = patterns(
    '',
    url(r'^api/', include('api.urls', namespace='api')),
    url(r'^admin/', include(admin.site.urls)),
    url(r'^oauth2/', include('oauth2_provider.urls',
                             namespace='oauth2_provider'))
)

api/url.py:

urlpatterns += [
url(r'^api-auth/', include('rest_framework.urls',
                           namespace='rest_framework')),
]

我该怎么办？