Models did not validate

[rjmoggach]

Possible user error but this would be the right place to track it for other troubleshooters -

I get the following error when attempting to validate my models:

CommandError: One or more models did not validate:
django_comments.comment: Accessor for field 'content_type' clashes with related field 'ContentType.content_type_set_for_comment'. Add a related_name argument to the definition for 'content_type'.
django_comments.comment: Reverse query name for field 'content_type' clashes with related field 'ContentType.content_type_set_for_comment'. Add a related_name argument to the definition for 'content_type'.
django_comments.comment: Accessor for field 'site' clashes with related field 'Site.comment_set'. Add a related_name argument to the definition for 'site'.
django_comments.comment: Accessor for field 'user' clashes with related field 'User.comment_comments'. Add a related_name argument to the definition for 'user'.
django_comments.comment: Reverse query name for field 'user' clashes with related field 'User.comment_comments'. Add a related_name argument to the definition for 'user'.
django_comments.commentflag: Accessor for field 'user' clashes with related field 'User.comment_flags'. Add a related_name argument to the definition for 'user'.
django_comments.commentflag: Reverse query name for field 'user' clashes with related field 'User.comment_flags'. Add a related_name argument to the definition for 'user'.

[timgraham]

Duplicate of #3 - quoting the resolution on that ticket: "You probably have both the old django.contrib.comments and the new django_comments apps installed at the same time."