Steamroller challenge

Hi–for this challenge, which is in the Intermediate Algorithm Scripting section, I coded it correctly, but I keep getting the following:
// running tests Your solution should not use the Array.prototype.flat() or Array.prototype.flatMap() methods. // tests completed.

I do not use those functions in my solution, but it does not let me continue. My solution is almost identical to the first proposed solution in the Get Help area. I even copied and pasted that solution, and it still gives me that error.

Please help as I’d like very much to move to the next challenge. Thanks so much!

See the discussion here: Intermediate Algorithm Scripting: Steamroller code validation issue?