vendor_record.Application_Status = ”Scheduled for Meeting”;

vendor_record.Application_Status = ”Scheduled for Meeting”;

Hello, I have a question.
I just learning Zoho creator and reading "Build a Vendor Selection app in 60 minuets".

But when I read to Page for workflow.
I got a error it indicated that "Field "Vendor" does not exist in form '{1}"
I have typed precisely as the book written.

Could you give me some advise for this trouble?