Problem on user profile

hi there,
I wanna build a user portal for my website. When a user log in, it can
modify it's profile in this portal. I have already followed "https://
docs.djangoproject.com/en/1.3/topics/auth/" and created a class named
UserProfile with "AUTH_PROFILE_MODULE = 'xxxxxxxx.UserProfile' in
settings.py. I also added
[code]
def create_user_profile(sender, instance, created, **kwargs):
if created:
UserProfile.objects.create(user = instance)

post_save.connect(create_user_profile, sender = user)
[/code]
at the end of models.py.
But this script cannot work well. When I add a user in admin site, a
error would raise with
[code]
IntegrityError at /admin/auth/user/add/

column User_id is not unique

Request Method: POST
Request URL: http://localhost:8000/admin/auth/user/add/
Django Version: 1.3.1
Exception Type: IntegrityError
Exception Value:

column User_id is not unique

Exception Location: /home/bear/work/django/djangoenv/lib/python2.7/
site-packages/Django-1.3.1-py2.7.egg/django/db/backends/sqlite3/
base.py in execute, line 234
Python Executable: /home/bear/work/django/djangoenv/bin/python
Python Version: 2.7.2
Python Path:

['/home/bear/work/django/ciscoaaa',
'/home/bear/work/django/djangoenv/lib/python2.7/site-packages/
distribute-0.6.15-py2.7.egg',
'/home/bear/work/django/djangoenv/lib/python2.7/site-packages/pip-1.0-
py2.7.egg',
'/home/bear/work/django/djangoenv/lib/python2.7/site-packages/
Django-1.3.1-py2.7.egg',
'/home/bear/work/django/djangoenv/lib/python2.7',
'/home/bear/work/django/djangoenv/lib/python2.7/plat-linux2',
'/home/bear/work/django/djangoenv/lib/python2.7/lib-tk',
'/home/bear/work/django/djangoenv/lib/python2.7/lib-old',
'/home/bear/work/django/djangoenv/lib/python2.7/lib-dynload',
'/usr/lib/python2.7',
'/usr/lib/python2.7/plat-linux2',
'/usr/lib/python2.7/lib-tk',
'/home/bear/work/django/djangoenv/lib/python2.7/site-packages']

Server time: Wed, 28 Sep 2011 20:16:02 +0800
[/code]

BTW: I wanna make a user portal which allow users to modify their
profiles by themselves. Can I use Admin Site to do this? Or I have to
write a brand-new web page for this? Thanks.

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