Grader error- week 3, assignment 1

Hi, I’ve got a bit of a problem with the grader output. Despite passing al the tests, I keep getting a score of 0/100, along with the following error message:

[ValidateApp | ERROR] nbgrader encountered a fatal error while trying to validate ‘submitted/courseraLearner/W3A1/Autonomous_driving_application_Car_detection.ipynb’

I noticed that I have somehow duplicated the cell of the test for the iou(), but I don’t know how to remove the cell. I’ve already tried refreshing my lab etc., but nothing seems to help.

All tips are welcome :slight_smile:

Click in a cell to highlight it.
Then click on the “scissor” tool in the menu toolbar to delete it.

Hi, unfortunately that doesn’t work either, it was one of the first things I tried