Django auth customing error

I want to custom the django auth app, since the default auth app can not meet our project's requierment. Then I figure it out on my own by checking the django document at here.https://docs.djangoproject.com/en/1.6/topics/auth/customizing/#a-full-example. I tried to do that example exactly. Finally, I added AUTH_USER_MODEL = "intelic_auth.MyUser" setting in my settings.py. But I got this error below when I tried to run "python manage.py syncdb". I don't know why. I would be very appreciated if someone can help me figure it out.

CommandError: One or more models did not validate:    helpdesk.ticket: 'assigned_to' defines a relation with the model 'auth.User', which has been swapped out. Update the relation to point at settings.AUTH_USER_MODEL.    helpdesk.followup: 'user' defines a relation with the model 'auth.User', which has been swapped out. Update the relation to point at settings.AUTH_USER_MODEL.    helpdesk.savedsearch: 'user' defines a relation with the model 'auth.User', which has been swapped out. Update the relation to point at settings.AUTH_USER_MODEL.    helpdesk.usersettings: 'user' defines a relation with the model 'auth.User', which has been swapped out. Update the relation to point at settings.AUTH_USER_MODEL.    helpdesk.ticketcc: 'user' defines a relation with the model 'auth.User', which has been swapped out. Update the relation to point at settings.AUTH_USER_MODEL.

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