All tests pass and I recreated the notebook and still the only feedback I get is:
The notebook you provided has a syntax error that prevents it from compiling.
I can share my notebook if necessary but it works fine in my opinion.
I also tried to submit the empty solution and got the same feedback
In scenarios like these, it is best to fetch a latest copy of the notebook and try again.
Having the same issue - I refreshed the notebook and got the same error on a fresh copy of the the notebook with no changes.
Facing the same issue. Tried fetching a latest copy of the NB and getting the same error. Was someone able to solve it?