based on your grader error and failed test output, it is pointing in the cell where you are suppose to write codes so that codes direct you to the file or directory needs to mentioned is incorrect written.
Also make sure you working on the latest version of the assignment.
The grader output error which mentions points to that there was probably some editing done beyond where you weren’t suppose to do. So to resolve this issue, you need to get fresh copy of assignment and re-do your assignment.
Not defined error of test cell points you probably didn’t run all the cells or any of the cells didn’t run all the codes successful before it timed out as each cell is assigned with a given time for the codes to run successfully and when a coder hard-coded the path to the recalled function, it throws error of runtime error. To assist you with this, please refer the pinned link comment, c1w2
If you want to know how to get a fresh copy of the assignment, then refer this link Get fresh copy
Let me know if your issue still persist.
Regards
DP