DATE in MODULES type *SRVPGM not found.

I am following [this article](
http://www.mcpressonline.com/programming/rpg/using-rpg-in-sql.html) to
create a UDF. The only difference from the article is the names and the RPG
logic. When I tried to test it I get:

SELECT ConvertToDate(DDATE), DPERNO FROM PBMASTP
DATE in MODULES type *SRVPGM not found.

I know the path is correct and I have confirmed it to be correct. Here is
what the CREATE FUNCTION looks like:

CREATE FUNCTION CONVERTTODATE (
DATEIN DECIMAL(8, 0) )
RETURNS DATE
LANGUAGE RPGLE
SPECIFIC QMFILES.CONVERTTODATE
DETERMINISTIC
NO SQL
RETURNS NULL ON NULL INPUT
NO EXTERNAL ACTION
NOT FENCED
EXTERNAL NAME 'MODULES/DATE(ConvertToDate)'
PARAMETER STYLE SQL ;

Any thoughts? This is my first UDF I have tried to create.

--
Mike Wills
http://mikewills.me