Am I right to asume this is not related to course 3? If so, could you provide more details about where are you facing the trouble (Course, Week, Assignment details) and ideally move your post to the corresponding Course in the forum? That way you will probably get the right support
This thread is 3 years old, although it may be similar to the problem you are facing, but it is always best to start a fresh query with error messages to get a speedy response.