Course 5, week 3 grader giving 0

In the last assignment in week 3 (trigger word detection), grader is giving me 0/100 apparently because Cell #24. Can't compile the student's code. Error: FileNotFoundError(2, 'No such file or directory'), my code passed every test in the assignment. Anybody knows what should I do?

Perhaps your notebook folder is missing a file that the grader uses.
Check in the Help menu to see if there have been any updates.

I’ve completed the assignment within coursera could, so I don’t believe it’s a problem on my part, especially since the notebook passed all the tests

The unit tests never catch all possible errors in your code.
But a missing file is a different issue entirely.