Receiving 0/100 points though completed all unit tests in the notebook

Hello everyone, apparently the problem is a not existing variable parameters_2, 

it is clearly a technical issue with unit test, but still annoying,
any help to solve this is quite welcome!

Thank You

Solved, don’t change this before submitting!

Hi @Roman_Popov ,

It is likely that the execution environment is out of sync. To bring it up-to-date, go to the menu bar on top of your notebook, select:
Kernel → restart and clear output
Cell → run all

After checking all the unit tests are passed without any error, then submit your assignment.

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Thank you for your answer, apparently it is an optional cell in the assignment that shouldn’t play a role in grading.