Similar error. In my case the error was:
RemovedInDjango19Warning: Model class django.contrib.sites.models.Site doesn't declare an explicit app_label and either isn't in an application in INSTALLED_APPS or else was imported before its application was loaded. This will no longer be supported in Django 1.9.
class Site(models.Model):
My solution was:
Added 'django.contrib.sites'
to INSTALLED_APPS