Official tutorial part 4

Hi, 

i have a problem in part 4 of official django tutorial, somebody can help me?

Error:

Reverse for 'polls.detail' with arguments '(4,)' and keyword arguments '{}' not found. 0 pattern(s) tried: []

Index.html (template)

{% if latest_poll_list %}  	    <ul>  	    {% for poll in latest_poll_list %}  	         <li><a href="{% url 'polls.detail' poll.id %}">{{ poll.question }}</a></li>  	    {% endfor %}  	    </ul>  {% else %}  	    <p>No polls are available.</p>  {% endif %}

views.py (polls)

from django.shortcuts import render, get_object_or_404  from django.http import HttpResponse  from polls.models import Poll  # Create your views here.  def index(request):      latest_poll_list = Poll.objects.order_by('-pub_date')[:5]      context = {'latest_poll_list':latest_poll_list}      return render(request, 'polls/index.html',context)  def detail(request,poll_id):      poll = get_object_or_404(Poll,pk=poll_id)      return render(request, 'polls/detail.html',{'poll':poll})  def results(request,poll_id):      return HttpResponse("You're looking at results of poll %s." % poll_id)  def vote(request,poll_id):      return HttpResponse("You're voting on poll %s." % poll_id)  

urls.py (mysite)

from django.conf.urls import patterns, include, url

from django.contrib import admin

admin.autodiscover()

urlpatterns = patterns('',

    # Examples:

    # url(r'^$', 'app.views.home', name='home'),

    # url(r'^blog/', include('blog.urls')),

    url(r'^polls/', include('polls.urls', namespace="polls")),

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

)

Thanks for any help.

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