D:\\zjm_code\\basic_project>python manage.py syncdb
Error: One or more models did not validate:
topics.topic: Accessor for field \'content_type\' clashes with rel
This isn't an ultimate answer for the question, however for someone it may solve the problem. I got the same error in my project after checking out a really old commit (going to detached head state) and then getting the code base back up to date. Solution was to delete all *.pyc files in the project.