Course 4 Week1 Programming Assignments,, All test passed but grade 0/100

In Convolutional Model, Step by Step , for all graded exercises ‘all test passed’, but final grade is 0/100 .
Grader sends this message:
[ValidateApp | INFO] Validating ‘/home/jovyan/work/submitted/courseraLearner/W1A1/Convolution_model_Step_by_Step_v1.ipynb’
[ValidateApp | ERROR] Traceback (most recent call last):
File “/opt/conda/lib/python3.7/site-packages/nbgrader/preprocessors/checkcellmetadata.py”, line 11, in preprocess
MetadataValidator().validate_nb(nb)
File “/opt/conda/lib/python3.7/site-packages/nbgrader/nbgraderformat/v3.py”, line 107, in validate_nb
raise ValidationError(“Duplicate grade id: {}”.format(grade_id))
jsonschema.exceptions.ValidationError: Duplicate grade id: cell-429520eed87675d9

[ValidateApp | ERROR] Notebook failed to validate; the nbgrader metadata may be corrupted.
[ValidateApp | ERROR] Traceback (most recent call last):
File “/opt/conda/lib/python3.7/site-packages/nbgrader/apps/validateapp.py”, line 72, in start
validator.validate_and_print(filename)
File “/opt/conda/lib/python3.7/site-packages/nbgrader/validator.py”, line 340, in validate_and_print
results = self.validate(filename)
File “/opt/conda/lib/python3.7/site-packages/nbgrader/validator.py”, line 311, in validate
nb = self._preprocess(nb)
File “/opt/conda/lib/python3.7/site-packages/nbgrader/validator.py”, line 290, in _preprocess
nb, resources = pp.preprocess(nb, resources)
File “/opt/conda/lib/python3.7/site-packages/nbgrader/preprocessors/checkcellmetadata.py”, line 16, in preprocess
raise ValidationError(msg)
jsonschema.exceptions.ValidationError: Notebook failed to validate; the nbgrader metadata may be corrupted.

[ValidateApp | ERROR] nbgrader encountered a fatal error while trying to validate ‘submitted/courseraLearner/W1A1/Convolution_model_Step_by_Step_v1.ipynb’

Could you help me , please?

Sounds like some reserved cells in your notebook were modified, and the grader became confused.

{edited reply}

Thank you for your time. I am attaching my notebook.

{mentor edit: notebook file removed}

I did ask you to attach it to a private message, not post it on the Forum.

There is invisible data stored in the notebook files, and it appears that somehow, yours has been corrupted. It can’t be fixed.

So the suggestion from the course staff is that you should rename your notebook, get a fresh copy of the notebook (using the “Help” menu), and then hand-copy your code from the old notebook to the new one.

I will do so . Thanks.Regards.

Please report back on your results.

It is already solved. Thanks , greetings