Sequences, Time Series and Prediction C4W1 Submission Problem

Hello, I want to ask about my problem with the programming assignment, working with generated time series, in Coursera. So I have done it properly and the output is all tests passed, but when I submitted it, the result was always 0%. I have restarted the kernel, reboot, and also restarted my laptop but the result is still 0%. Is there some suggestion to resolve this problem?
Thank You

Hello! Welcome to the community!

I believe you may have changed something you shouldn’t have in the task. My suggestion is to restart the activity by following the instructions here or post. If possible, save your solutions before doing this and make sure to only modify or add your answer within the designated fields.

If this doesn’t solve the issue, feel free to send me your notebook so I can analyze it in more detail.

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If you click on any of the > markers in the grader report, that will display the detailed grader feedback.

Please post images of that.

Thank you so much sir, problem solved