Stored Procedure( OUT PARAMETER) CANT CALLED.. HELP ME

[RESHA]

CREATE PROCEDURE get_maxprice(OUT M_TotalPrice DECIMAL(5,2))
BEGIN
	SELECT MAX(VALUE) INTO M_TotalPrice
	FROM 
	(
 	SELECT SUM(subTotal) AS VALUE
 	FROM CustomerOrder
	);
END@

CALL get_maxprice(@11111);

WHY I cant Called the procedure..They said they have error?

[Anas Mosaad]

try

CALL get_maxprice(?)
@