NoReverseMatch in Django (url ploblem)

I'm a beginner of Django I want to set my url with database field_name instead of use primary key from Django tutorial. This is my code.

*mysite*  **dwru/urls.py**  urlpatterns = [      url(r'^$', include('product.urls', namespace="product")),  ]    *myapp*  **product/urls.py**  urlpatterns = [     url(r'^$', views.index, name='index'),     url(r'^(?P<name_catalog>[-_\w]+)/$', views.product_list_from_index, name='catalog'),  ]    **product/views.py**  def product_list_from_index(request, name_catalog):     catalog = get_object_or_404(Catalog, name_catalog=name_catalog)     context = {     'catalog': catalog  }     return render(request,'product/product_list.html', context)      **product/models.py**  class Catalog(models.Model):    name_catalog = models.CharField(max_length=45)    product = models.ManyToManyField(Product)    **template/product/index.html**  {% for catalog in catalog_list %}      <h1><a href="{% url 'product:catalog' catalog.name_catalog %}">{{ catalog.name_catalog }}</h1>  {% endfor %}

Then I add Catalog field with "TestCa01" then it shown an error

NoReverseMatch at /  Reverse for 'catalog' with arguments '(u'TestCa01',)' and keyword arguments '{}' not found. 1 pattern(s) tried: [u'$(?P<name_catalog>[-_\\w]+)/$']

it kind of some problem with this line in template

{% url 'product:catalog' catalog.name_catalog %}

any Idea?

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