C4 W2 A2: Unknown problem of the grader with accuracy metric

I just finished the second assignment of week 2 and all tests are correctly passed . However, I got 66/100 ! The grader mentioned the following :

Code Cell UNQ_C1: Function ‘data_augmenter’ is correct.
Code Cell UNQ_C2: Function ‘alpaca_model’ is correct.
Code Cell UNQ_C3: The value of your variable ‘loss_function’ is correct.
Code Cell UNQ_C3: The value of your variable ‘optimizer’ is correct.
Code Cell UNQ_C3: You have an incorrect value for ‘metrics’ variable. We expected a value of ‘accuracy’ and you have ‘a’.
If you see many functions being marked as incorrect, try to trace back your steps & identify if there is an incorrect function that is being used in other steps.
This dependency may be the cause of the errors.

Note that I identified the accuracy metric as follows:

Use accuracy as evaluation metric

metrics=[‘accuracy’]

Could anyone explain to me why the grader did this output?

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Did you save your notebook before you submitted it for grading?

Thank you for your response. I think I missed this step before submitting my assignment. It is correctely graded now

Thanks for the feedback. It seems for submitting assignments for this notebook you need to have completed all exercises before it is getting correctly graded. Only once tests passed for UNC_C3 my grading worked, the exercises have been defined in such a way that they throw errors if not solved