ERROR 1418: This function has none of DETERMINISTIC, NO SQL, or READS SQL DATA in its declaration and binary logging is enabled

CREATE FUNCTION printDate ()
RETURNS varchar(45)
  BEGIN RETURN
    DATE(DW)+ ' , ' +
    DATE(DAY)+ ' , ' +
    DATE(MONTH)+ ' , ' +
    DATE(YEAR);
END;

AT first was showing ERROR 1418 & failed applied. Then showing successfully applied but showing “Error getting DDL for object” “FUNCTION printDate does not exist”

and no function showing in the database