[Python] No module named urls

I'm following the Django Tutorials, I'm at the end of part 3, at Decoupling the URLconfs, at http://docs.djangoproject.com/en/1.1/intro/tutorial03/#intro-tutorial03 and I'm getting a "No module named urls" error message.

When I change:

from django.conf.urls.defaults import *

from django.contrib import admin
admin.autodiscover()

urlpatterns = patterns('mysite.polls.views',
(r'^polls/$', 'index'),
(r'^polls/(?P<poll_id>\d+)/$', 'detail'),
(r'^polls/(?P<poll_id>\d+)/results/$', 'results'),
(r'^polls/(?P<poll_id>\d+)/vote/$', 'vote'),
(r'^admin/', include(admin.site.urls)),
)


to:

from django.conf.urls.defaults import *

from django.contrib import admin
admin.autodiscover()

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


I changed include('mysite.polls.urls')), to include(mysite.polls.urls)),, but it still didn't work.

How to solve this problem?

UPDATE 2: at mysite/polls/urls.py is

from django.conf.urls.defaults import *

urlpatterns = patterns('mysite.polls.views',
(r'^$', 'index'),
(r'^(?P<poll_id>\d+)/$', 'detail'),
(r'^(?P<poll_id>\d+)/results/$', 'results'),
(r'^(?P<poll_id>\d+)/vote/$', 'vote'),
)


UPDATE 4: the whole project is at

http://www.mediafire.com/?t1jvomjgjz1

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