stored proc help

I have the following store dproc but when I run it I am getting the error

ERROR:  invalid input syntax for integer: "(1)"

CONTEXT:  PL/pgSQL function "irispermissionget" line 9 at return next

What am I doing wrong?

CREATE OR REPLACE FUNCTION "public"."irispermissionget" (username varchar, pass varchar) RETURNS SETOF integer AS

$body$

declare

returnRec Record;

begin

for returnRec in select cast(irisuserpermission.permissionid as integer)

from irisuserpermission INNER JOIN public.irisuser ON (public.irisuserpermission.irisuserid = public.irisuser.id)

where irisuser.user = username and irisuser.password = pass

loop

             return next returnRec;

     end loop;

     return;

end;

$body$

LANGUAGE 'plpgsql' VOLATILE CALLED ON NULL INPUT SECURITY INVOKER;