I am also facing same issue even though followed above steps
@libtech_2020, have you gone through this support article? It should solve your issue:
hi,the error message was displaying even though there was nothing wrong in my server settings.I checked once again my script and found there was a unnecessary keyword in the choices sheet.my problem was solved by deleting that keyword.Thank you…
Thank you for confirming and sharing the solution with the entire community, @libtech_2020!