Hi,
I got a ‘grading failed’ error when submitting the programming assignment:
I’m wondering if this means any issue with the grader system? Or something is wrong with my answers? Thanks!
Well anything is possible, but the first theory would be that your code has some problems. Do you pass all the tests in the notebook? If so, then you may have made the mistake of referencing global variables in your back_substitution function. Or you can also get grader errors like that if you accidentally modify other parts of the notebook that the grader depends on like the “GRADED FUNCTION” comment lines.
First please confirm whether you pass the tests in the notebook.
Thank you! I submitted it again, and now it’s 100% passed! 
A transient issue~ 
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That’s good news! Thanks for confirming.