Can't compile the student's

Hey guys,

I do all the test, but when I want to submit the assignment give this error.
what shall I do?

Please post the entire text of the error message you got from the grader.

Cell #UNQ_C5. Can’t compile the student’s code. Error: ValueError(‘Could not interpret optimizer identifier: None’)

Perhaps you left one of the “None” statements in the notebook, which you should have updated to the correct value.

it’s done,
thank you