Broken attempt to use neo4django admin interface

models.py

from neo4django.graph_auth.models import User as GraphUser

class User(GraphUser):
    objects = UserManager()
   
    slug = models.StringProperty()
    birthday = models.DateProperty()
    gender = models.StringProperty()
    middle_name = models.StringProperty()
         
    profiles = models.Relationship('Profile',
                                  rel_type='belongs_to',
                                  related_name='owner')
                                  

settings.py

...
AUTHENTICATION_BACKENDS = ('neo4django.graph_auth.backends.NodeModelBackend',
                           )
...
AUTH_USER_MODEL = 'myapp.User'

INSTALLED_APPS = (
    'neo4django.graph_auth',
    'django.contrib.sessions',
    'django.contrib.messages',
    'neo4django.admin',
    'neo4django.contenttypes',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    #'django.contrib.sites',
    'django.contrib.staticfiles',
    'tastypie',
    'django.contrib.admin',
    'myapp',
)
...

urls.py

from django.conf.urls import patterns, include, url  # @UnusedImport
from neo4django import admin
admin.autodiscover()

urlpatterns = patterns('',
    ...
    url(r'^admin/', include(admin.site.urls)),
    ...
)