Error: A listener indicated an asynchronous responses by returning true

[Deepti_Prasad]

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

Regards
DP