Hey Eduardo, Many thanks for the reply. Yes, you are right, using the django-newsletter development branch from github (which has upgrades for the newer django migrations without south) things worked, and this error no longer occurred.
> > -- 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 mezzanine-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.