Unclear error when grading

Course Q&A TensorFlow: Data and Deployment Specialization Advanced Deployment Scenarios with TensorFlow
1

I get the following error message when submitting to grader

Sorry, your submission was incorrect. Please try again. list index out of range

What does it mean? How do I fix this?

2

ok, I realized I misspelled channels in

tf.image.decode_png

It works now

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