C5_W4_A1 everything works fine in notebook but grader gives me zero

Course Q&A Deep Learning Specialization Sequence Models
1

Hi, I have completed the assignment and everything works fine in notebook but grader is throwing the following error.

Cell #22. Can’t compile the student’s code. Error: TypeError(“unsupported operand type(s) for *=: ‘NoneType’ and ‘NoneType’”)

But I’m not getting any errors in notebook

2

Did you complete all of the parts of the assignment before you submitted it? You can’t submit a partial assignment.