For the Calendars field, unselect the Map option, and then pick the calendars from the list.
You are not meant to type into that field unless you know what you’re doing.
Hope this helps! Let me know if there are any further questions or issues.
— @samliew
P.S.: Did you know, the concepts of about 70% of questions asked on this forum are already covered in the Make Academy. Investing some effort into it will save you lots of time and frustration using Make later!