I don't know what to do on sudoku solver

Tell us what’s happening:
I can’t pass any of the unit tests because it keeps saying in the console “TypeError: Cannot read property ‘solve’ of undefined”.

Also, 5 of the functional tests give me “Uncaught AssertionError: expected undefined to equal false”, but it doesn’t show me what to fix.

And I can’t figure out how to do “If value submitted to /api/check is already placed in puzzle on that coordinate, the returned value will be an object containing a valid property with true if value is not conflicting.”

Help me please, I’ve been stuck on this for about 2 weeks.

Edit - Still stuck and it has been for over 5 weeks. Also, I don’t know what happened, but now 6 tests are failing when I originally had 3 tests failing.

Your project link(s)

solution: https://replit.com/@celestiaimoon/boilerplate-project-sudoku-solver

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Challenge: Sudoku Solver

Link to the challenge: