Error on calling SQL Stored procedure

Routine MYROUTINE in MYDEMO not found with specified parameters is the error.

CREATE OR REPLACE PROCEDURE mydemo.myroutine(
                IN  Code VARCHAR(10),
                IN  APIKEY    VARCHAR(50),
                OUT  txtout VARCHAR(50),
                OUT curValue FLOAT,
                OUT conditions VARCHAR(50)
            )
        LANGUAGE sql
        RESULT SETS 0

.............(procedure code here)


Call it this way:

CALL MYDEMO/MYROUTINE ('78888', '91737ac3b9db0bgfd4325c2675e02126')

I have tried this:  CALL MYDEMO/MYROUTINE ('78888', '91737ac3b9db0bgfd4325c2675e02126', ?,?,?)  but that returns  "Use of parameter marker or NULL not valid."

I don't spend much time in SQL-land so I am probably missing something simple.  I assume it is complaining about the call parameters or the way it is called.  But could there be other causes?