Well, I wondered what happened here and googling was futile.
Was getting errors on django.contrb.auth.views.login
If Site._meta.installed:
current_site = Site.objects.get_current()
After reading into what that does, it pulls SITE_ID out of your settings to check what db to look into. Well, my django project had a SITE_ID of 2 from many months ago.
Simply changed that to one and problem fixed.
Yuji Tomita 
This was my problem exactly. Thanks so much!
Awesome. Glad it helped somebody!
Another one with the same problem, after over a year with Django. Weird. Thanks!
saved me a lot of trouble, thanks 🙂
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