old_contents: from django.conf.urls import patterns, include, url
  from django.contrib.staticfiles.urls import staticfiles_urlpatterns
  from crowdsourcing import views
  from crowdsourcing.viewsets.project import *
  from crowdsourcing.viewsets.user import UserViewSet, UserProfileViewSet, UserPreferencesViewSet
  from crowdsourcing.viewsets.requester import RequesterRankingViewSet, RequesterViewSet
  from crowdsourcing.viewsets.worker import SkillViewSet, WorkerSkillViewSet, WorkerViewSet, TaskViewSet, WorkerModuleApplicationViewSet, TaskWorkerResultViewSet, QualificationViewSet , CurrencyViewSet
  
  
  from rest_framework.routers import SimpleRouter
  router = SimpleRouter(trailing_slash=True)
  router.register(r'api/profile',UserProfileViewSet)
  router.register(r'api/user', UserViewSet)
  router.register(r'api/preferences', UserPreferencesViewSet)
  router.register(r'api/requesterranking', RequesterRankingViewSet)
  router.register(r'api/requester', RequesterViewSet)
  router.register(r'api/project', ProjectViewSet)
  router.register(r'api/category', CategoryViewSet)
  router.register(r'api/module', ModuleViewSet)
  router.register(r'api/projectrequester', ProjectRequesterViewSet)
  router.register(r'api/worker-skill', WorkerSkillViewSet)
  router.register(r'api/worker', WorkerViewSet)
  router.register(r'api/skill', SkillViewSet)
  router.register(r'api/task', TaskViewSet)
  router.register(r'api/task-worker', TaskWorkerViewSet)
  router.register(r'api/worker-module-application', WorkerModuleApplicationViewSet)
  router.register(r'api/qualification', QualificationViewSet)
  router.register(r'api/currency', CurrencyViewSet)
  
  
  
  urlpatterns = patterns('',
                         url(r'^api/v1/auth/forgot-password/$',views.ForgotPassword.as_view()),
                         url(r'^api/v1/auth/reset-password/(?P<reset_key>\w+)/(?P<enable>[0-1]*)/$',views.reset_password),
                         url(r'^api/v1/auth/registration-successful',views.registration_successful),
                         url(r'^api/v1/auth/logout/$', views.Logout.as_view()),
                         url(r'^/account-activation/(?P<activation_key>\w+)/$', views.activate_account),
                         url(r'^api/oauth2/', include('oauth2_provider.urls', namespace='oauth2_provider')),
                         url(r'^api/oauth2-ng/token', views.Oauth2TokenView.as_view()),
                         url(r'^api-auth/', include('rest_framework.urls', namespace='rest_framework')),
                         url(r'', include(router.urls)),
                         url('^.*$', views.home, name='home'),
                         )
  
  urlpatterns += staticfiles_urlpatterns()
  
new_contents: from django.conf.urls import patterns, include, url
  from django.contrib.staticfiles.urls import staticfiles_urlpatterns
  from crowdsourcing import views
  from crowdsourcing.viewsets.project import *
  from crowdsourcing.viewsets.user import UserViewSet, UserProfileViewSet, UserPreferencesViewSet
  from crowdsourcing.viewsets.requester import RequesterRankingViewSet, RequesterViewSet
  from crowdsourcing.viewsets.worker import SkillViewSet, WorkerSkillViewSet, WorkerViewSet, WorkerModuleApplicationViewSet, TaskWorkerResultViewSet
  from crowdsourcing.viewsets.task import QualificationViewSet, TaskViewSet
  
  
  from rest_framework.routers import SimpleRouter
  router = SimpleRouter(trailing_slash=True)
  router.register(r'api/profile',UserProfileViewSet)
  router.register(r'api/user', UserViewSet)
  router.register(r'api/preferences', UserPreferencesViewSet)
  router.register(r'api/requesterranking', RequesterRankingViewSet)
  router.register(r'api/requester', RequesterViewSet)
  router.register(r'api/project', ProjectViewSet)
  router.register(r'api/category', CategoryViewSet)
  router.register(r'api/module', ModuleViewSet)
  router.register(r'api/projectrequester', ProjectRequesterViewSet)
  router.register(r'api/worker-skill', WorkerSkillViewSet)
  router.register(r'api/worker', WorkerViewSet)
  router.register(r'api/skill', SkillViewSet)
  router.register(r'api/task', TaskViewSet)
  router.register(r'api/task-worker', TaskWorkerViewSet)
  router.register(r'api/worker-module-application', WorkerModuleApplicationViewSet)
  router.register(r'api/qualification', QualificationViewSet)
  
  
  
  
  urlpatterns = patterns('',
                         url(r'^api/v1/auth/forgot-password/$',views.ForgotPassword.as_view()),
                         url(r'^api/v1/auth/reset-password/(?P<reset_key>\w+)/(?P<enable>[0-1]*)/$',views.reset_password),
                         url(r'^api/v1/auth/registration-successful',views.registration_successful),
                         url(r'^api/v1/auth/logout/$', views.Logout.as_view()),
                         url(r'^/account-activation/(?P<activation_key>\w+)/$', views.activate_account),
                         url(r'^api/oauth2/', include('oauth2_provider.urls', namespace='oauth2_provider')),
                         url(r'^api/oauth2-ng/token', views.Oauth2TokenView.as_view()),
                         url(r'^api-auth/', include('rest_framework.urls', namespace='rest_framework')),
                         url(r'', include(router.urls)),
                         url('^.*$', views.home, name='home'),
                         )
  
  urlpatterns += staticfiles_urlpatterns()
  
subject: Update urls.py