==================================== ERRORS ====================================____________________ ERROR collecting tests/test_routers.py ____________________tests/test_routers.py:84: in <module>    url(r'^namespaced/', include(namespaced_router.urls, namespace='example')),/django/conf/urls/__init__.py:44: in include    'Specifying a namespace in django.conf.urls.include() without 'E   django.core.exceptions.ImproperlyConfigured: Specifying a namespace indjango.conf.urls.include() without providing an app_name is not supported.Set the app_name attribute in the included module, or pass a 2-tuple containingthe list of patterns and app_name instead.__________________ ERROR collecting tests/test_versioning.py ___________________tests/test_versioning.py:166: in <module>    class TestURLReversing(URLPatternsTestCase):tests/test_versioning.py:173: in TestURLReversing    url(r'^v1/', include(included, namespace='v1')),/django/conf/urls/__init__.py:44: in include    'Specifying a namespace in django.conf.urls.include() without 'E   django.core.exceptions.ImproperlyConfigured: Specifying a namespace indjango.conf.urls.include() without providing an app_name is not supported.Set the app_name attribute in the included module, or pass a 2-tuple containingthe list of patterns and app_name instead.