"NoReverseMatch at /courses/" Local Instance, have read through threads but am still stumped.

Hi Sam,

Did you namespace the 'courses' app in the main project's urls.py? If so, then I believe Kenneth is using 'courses' (plural) as the namespace. In your template, you are calling a singular 'course' namespace.

# learning_site/urls.py
urlpatterns = [
    url(r'^courses/', include('courses.urls', namespace='courses')),
    url(r'^admin/', admin.site.urls),
    url(r'^$', views.hello_world, name='hello'),
]

# course_list.html
<a href="{% url 'courses:detail' %}">{{ course.title}}</a>

There are a few other issues as well:

You have named your url's backwards. "step_detail" should be named "step", and "course_detail" should be named "detail". So even if your namespace is correct, you are calling the wrong view.

Also, you should make sure the order of your url regex's matches those in the video. I believe Kenneth lists them in this order: course_list, step_detail, course_detail. Since Django goes through the list in order to try and match a pattern, this prevents it from stopping at the first matched group name. In your case, "course_detail" might be matched before "step_detail", even if you were trying to match "step_detail".

So it should look like this:

# courses/urls.py
urlpatterns = [
    url(r'^$', views.course_list, name="list"), 
    url(r'(?P<course_pk>\d+)/(?P<step_pk>\d+)/$', views.step_detail, name="step"),
    url(r'(?P<pk>\d+)/$', views.course_detail, name="detail"),
]

And I'm not sure if this is just a typo in your question, but the template file should be named "course_list.html" (singular), not "course_lists.html".

Hope this helps.

Thanks Ryan. Whats the best way to get ahold of you, are you on GIT?