zoho.books.getRecordsByID not working

zoho.books.getRecordsByID not working

Hello,

I am creating a function inside Zoho Books and this simple line is not working right now. It says "Client does not exist" and, of course, the client DOES exist
What am I doing wrong?

This is the line

response = zoho.books.getRecordsByID("contacts", "2006xxxx", "81921xxxxx");