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It’s hard to know what’s wrong from the exception message alone. But when you are using class based views, you must call the as_view()
function to use them in your url router.
https://docs.djangoproject.com/en/1.11/topics/class-based-views/#subclassing-generic-views
So change all the cbv routes (but not function views) in your urls.py
# BAD
url(r'^$', imagec_views.ListaFollow, name="lista_follow"),
# CORRECT
url(r'^$', imagec_views.ListaFollow.as_view(), name="lista_follow"),
Source:stackexchange.com