Grading Failed - Grader Error: Malformed feedback

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Week 4, Programming Assignment: Question Duplica

After creating a submission following is displayed:

Grader Error:

Hi @QuyenNHHE130360,

At the start of the notebook there’s:

**Important Note on Submission to the AutoGrader**

Before submitting your assignment to the AutoGrader, please make sure you are not doing the following:

1. You have not added any extra print statement(s) in the assignment.
2. You have not added any extra code cell(s) in the assignment.
3. You have not changed any of the function parameters.
4. You are not using any global variables inside your graded exercises. Unless specifically instructed to do so, please refrain from it and use the local variables instead.
5. You are not changing the assignment code where it is not required, like creating extra variables.

If you do any of the following, you will get something like, Grader not found (or similarly unexpected) error upon submitting your assignment. Before asking for help/debugging the errors in your assignment, check for these first. If this is the case, and you don't remember the changes you have made, you can get a fresh copy of the assignment by following these instructions.

This clearly mentions if you do any of the listed things you will run into Grader not found error.

Please make sure you are not doing any of these listed things.


i have done 1 of the 5 you said. How should I now fix it. Can you help me? Thanks

You need to “undo” the changes in question. If you are in a situation in which you’ve lost the information about how it originally was, you can start over with a clean copy of the notebook and then “copy/paste” over your legitimate changes. Here’s a thread from DLS that explains how to do that. The method is not specific to DLS.

Please give that a try and let us know.

Hello everyone! I’m having the same issue but I have not change any cell I wasn’t supposed to. I even refreshed the worksapce by deleting all the files and getting the lastest version of them, but I still get the error. Please help me :c
The problem is in Tensoflow Developer Professional certificate, C1W1, but I’m also taking the MLOps Specialization C2W2.

Hello everyone! I found a solution, at least a temporal one for now. As the problem was related with metadata I not only refreshed the environment (deleting the folders, archives and then getting the lastest ones) but I also deleted all the cookies related to Coursera on my browser (I use Edge) and that allow me to get the 100points I deserved on my course in MLOps.

I hope this solution also works for you! :smiley: