ImpropyConfiguredError about app_name when using namespace in include()

I am currently trying out django. I use the namespace argument in one of my include()s in urls.py. When I run the server and try to browse, I get this error.

    File "C:\Users\User\AppData\Local\Programs\Python\Python36-32\lib\site-packages\django\urls\conf.py", line 39, in include
        'Specifying a namespace in include() without providing an app_name '
    django.core.exceptions.ImproperlyConfigured: Specifying a namespace in include() without providing an app_name is not supported. Set the app_name attribute in the included module, or pass a 2-tuple containing the list of patterns and app_name instead.

These are my urls.py files:

    #project/urls.py

    from django.conf.urls import include, url
    from django.contrib import admin

    urlpatterns = [
        url(r'^reviews/', include('reviews.urls', namespace='reviews')),
        url(r'^admin/', include(admin.site.urls)),
    ]

and

    #app/urls.py

    from django.conf.urls import url

    from . import views

    urlpatterns = [
        # ex: /
        url(r'^$', views.review_list, name='review_list'),
        # ex: /review/5/
        url(r'^review/(?P<review_id>[0-9]+)/$', views.review_detail, name='review_detail'),
        # ex: /wine/
        url(r'^wine$', views.wine_list, name='wine_list'),
        # ex: /wine/5/
        url(r'^wine/(?P<wine_id>[0-9]+)/$', views.wine_detail, name='wine_detail'),
    ]

What do I pass the app_name as stated in the error message?

Check the docs for include here.

What you've done is not an acceptable way of passing parameters to include. You could do:

    url(r'^reviews/', include(('reviews.urls', 'reviews'), namespace='reviews')),

From: stackoverflow.com/q/48608894

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