old_contents: from django.conf.urls import patterns, include, url
  from django.contrib import admin
  
  admin.autodiscover()
  
  urlpatterns = patterns('',
      url(r'^oauth2/', include('provider.oauth2.urls', namespace='oauth2')),
      url(r'^admin/', include(admin.site.urls)),
      url(r'', include('documentextractor.urls')),
  )
  
new_contents: from django.conf.urls import patterns, include, url
  from django.contrib import admin
  
  admin.autodiscover()
  
  urlpatterns = patterns('',
      url(r'^admin/', include(admin.site.urls)),
      url(r'', include('documentextractor.urls')),
  )
  
subject: Remove faulty URL line.