SQL0440 with Trigger and Stored Procedure

I'm trying to get a stored procedure working.  Just to let you know... 
this is the first time I've try to do this.  Ok.  I created a stored 
procedure with the following syntax :
CREATE PROCEDURE MFPUT_SP1 (CHAR(1), CHAR(10), CHAR(10), CHAR(10), CHAR
(10)) EXTERNAL NAME mylib/OURFTP LANGUAGE CL

This Stored procedure will be called by a database trigger that was 
defined by the following syntax :
CREATE TRIGGER MFPUT_T1 AFTER INSERT ON mylib/MFPUT CALL MFPUT_SP1 
('D', 'FTPSERVER ', 'FTPUSER   ', 'mylib     ', 'MEMBER    ')

So, after a record is added to table MFPUT I want the Trigger to call 
my Stored Procedure which runs my CL program. See, simple.

The CL program has the following parameters :
 DCL    VAR(&VERSION)   TYPE(*CHAR)   LEN(1)
 DCL    VAR(&SERVER)    TYPE(*CHAR)   LEN(10)
 DCL    VAR(&FTPUSER)   TYPE(*CHAR)   LEN(10)
 DCL    VAR(&PARMLIB)   TYPE(*CHAR)   LEN(10)
 DCL    VAR(&PARMMBR)   TYPE(*CHAR)   LEN(10)

When I start another session and use DFU to add a record I get the 
following error :
SQL0440 : Routine OURFTP in mylib not found with specified parameters
SQL0723 : SQL trigger MFPUT_TI in *N failed with SQLCODE -440 SQLSTATE 
42884.

The mylib library is in the System part of the libary list and the 
userid has access to the library.

Any thoughts?
m.