Error: A listener indicated an asynchronous responses by returning true

kindly try the below

  1. Deleting your cache and browser history.
  2. Deleting any copy of the assignment notebook in your system.
  3. Re-do the assignment by referring to the copy of assignment you just wrote codes.
  4. Using a different browser.
  5. Using a different system/computer.

If the issue still persist, let us know


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