The software that we use for e-assignment, Numbas, requires a fairly specific format for its input. If you are encountering strange errors when submitting an assignment, please check the following:
If you did all the above right and still have issues with the assignment, please post them in the technical support section in duo, and we'll take a look as quick as possible. Please include screenshots of what you attempted, together with the actual question that you got (the questions are generated randomly, so if you only post the answer we cannot tell if what you did is correct).
Finally, a reminder: the e-assignment system is set up so only the highest score is recorded. So you can try questions multiple times without penalty.