NoReverseMatch at / Reverse for 'profile' with arguments '('',)' not found. 1 pattern(s) tried: ['profile/(?P[^/]+)/$']

It's means something missing in database thats you are working for in loops .Django won't be able to properly construct the url if somthing is blank. First go to the Django admit panel and find whats are missing.Example:Author,User,Admin etc.