Syncdb error with new 1.5rc1

I used auth mixin before in my app, then made the changes to make it work on the official Django with new custom user.

The problem is that, when I run on my new empty db:
python manage.py syncdb --all

...
You just installed Django's auth system, which means you don't have any superusers defined.
Would you like to create one now? (yes/no): yes
E-mail address: em@il.xx
Password:
Password (again):
TypeError: create_superuser() takes exactly 4 arguments (3 given)

Do you know what is wrong?

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