Getting a PageNotFound 404 Error

Hi, folks! I'm new to Django, now I'm writing my first e-commerce in it, and now I'm having a mistake that I can not find in code myself. Please help me..

The code is the following:

The trouble URL code line :   url(r'^(?P<category_slug>[-/w]+)/$', views.category, name = 'category_detail'),

The view code : def category(request, category_slug):
                           c = get_object_or_404(Category, category_slug = category_slug)
                           products = c.product_set.all()
                           page_title = c.category_name
                           meta_keywords = c.category_meta_keywords
                           meta_description = c.category_meta_description
                           return render(request, 'categories/category.html', locals())

Thanks for your help in advance..

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