stored procedure blank in MySQL

DELIMITER $$
CREATE PROCEDURE sp_select_all_staff ()
      BEGIN
       SELECT first_name, last_name, staff_id
       FROM staff;
      END;
$$

DELIMITER ;

CALL sp_select_all_staff ();


**************************************
DELIMITER $$
CREATE PROCEDURE sp_staffOrdersServed()
BEGIN
    SELECT staff_id,
           COUNT(order_id) as orders_served
    FROM customer_orders
    GROUP BY staff_id;
END;
$$

DELIMITER ;

CALL sp_staffOrdersServed();