No module named admin.site.urls

If display error "No module named admin.site.urls", you have to rewrite follow

from django.conf.urls.defaults import *

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

from django.conf.urls.defaults import *
from django.contrib import admin
admin.autodiscover()

urlpatterns = patterns('',
     (r'^admin/(.*)',admin.site.root),
)

see also↓
http://webxy.wordpress.com/2008/12/04/django-no-module-named-urls-error-for-admin/