*Looks like you changed the name of the thread, and my reply went elsewhere. Here it is again:*
Well, the error message says you should check the SECRET_KEY setting. Have you done that? Most likely it was removed from your settings module when you upgraded to Mezzanine 4. I recommend you put it in local_settings.py to avoid having it under version control. Other than that, there's a know issue relating field injection of non-Django fields and Django 1.9: https://github.com/stephenmcd/mezzanine/issues/1513 -- You received this message because you are subscribed to the Google Groups "Mezzanine Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
