Please note that answers to the exercises should NOT be exchanged (either on the Q&A or elsewhere). (You may discuss the "self-check" solutions as much as you like though.) Might not be a bad idea to re-read the "Academic Honesty" portion of the syllabus...
INSTEAD, you *may* ask a related question that you think will help you solve this exercise, or you may even paste in a *small* portion of your code (but NOT your complete code) and ask people to help you see if there is anything wrong with it.
Also, a good question is more specific -- what seems to be wrong? What error message do you get (if any)?
Perhaps try again with a new question?