python - Receiving error: Reverse for with arguments '()' and keyword arguments not found -

i getting error creating link in django template.

my template looks this:

<a href="{% url 'location_detail' pk=location.id %}">{{ location.name }}</a>

my urls.py looks like:

url(r'^location(?p<pk>\d+)/$', views.location_detail, name="location_detail"),

my view looks like:

def location_detail(request, pk=none):

i error:

reverse views.location_detail arguments '()' , keyword arguments '{u'pk': 1l}' not found.

i'm using django 1.5 , python 2.7.2

thanks!

the problem had name space on primary project urls.py:

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

changing url to:

{% url 'com:location_detail' pk=location.id %}

that did trick

IO