C1_W3 Assignment Grader Error: Grader feedback not found on nn_model

I got " Grader Error: Grader feedback not found" on nn_model even unittest show output “All tests passed” and my code all is run.
I already try some advice like resubmit (I resubmit many times), restart & run all code, but nothing different. I still got error message.

What the point of the problem is this? And how I resolve?

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Most likely that means there is something structurally wrong with your notebook. We will need to look at your notebook. I will contact you by DM (Direct Message) about how to proceed with that.

Hi, I got the same problem. my due date of the course is tomorrow. can I get quick support?

The deadlines don’t matter: if you miss them, they just reset to a later date and there is no penalty.

I will send you a DM (Direct Message) about getting help.