The name specified after the word FUNCTION is not a recognized function-name. It is possible you are using the word "function" as a data-name. This word is a reserved word.
Resolution:
If you require an intrinsic function, ensure the name you have used is correct. If you want to use function as a data-name, resubmit your program with the directive REMOVE"FUNCTION" to remove the word FUNCTION from the reserved word list.
