Honestly I haven't yet mastered django urls. so i clearly have no idea how to go around this error.In ma `views.py` I have:

```
def get_category(request,id):
    categories = Category.objects.get(pk=id).prefetch_related('item')
    context={
        'categories':categories,
    }
    return render_to_response('category.html',context,context_instance=RequestContext(request))

```

In my `urls.py`: 

```
url(r'^menu/(\d+)$',get_category, name="f4l_menu"),

```

and in my template,

```
<a href="{% url f4l_menu category.id %}">

```

this is returning an error,

> 
> Reverse for 'f4l\_menu' with arguments '('',)' and keyword arguments '{}' not found.
> 
> 
> 

How can I fix this?