I have some problems with Django admin.
after syncdb, the result is:
Creating tables ... Installing custom SQL ... Installing indexes ... No
Since the above comments are pretty old and the syncdb command doesn't exist, and I don't want to remove django.contrib.sites, here's what worked for me:
syncdb
django.contrib.sites
Increment SITE_ID. I had SITE_ID = 1, changed it to SITE_ID = 2 and everything worked again.
SITE_ID
SITE_ID = 1
SITE_ID = 2