ImproperlyConfigured: Module "social.apps.django_app.utils" does not define a "BackendWrapper" authentication backend

[Salma7amed]

Since upgrading to version 0.1.19.
I do get a mail saying someone is receiving a 500 error, due to (ImproperlyConfigured: Module "social.apps.django_app.utils" does not define a "BackendWrapper" authentication backend).

It is not permanent. Meaning I don't get frequently, which means only in some specific cases this happen. Plz note I never got this error when using the older version 0.1.14

[omab]

BackendWrapper was removed since it was a hackish solution to workaround Django backend loading, but Django puts the backend name in the sessions, so any older user that's trying to access your site with an old session (previous to your upgrade) is probably triggering this issue, the quick fix is to clean the session entry for those users.

[dblado]

dupe of #128?

[omab]

@dblado, right, this is a duplication of #128