Greenplum + pgagent

Does someone know how to integrate pgagent with Greenplum?

I could install it but it says that:

function cannot execute on segment because it issues a non-SELECT statement
(fucntion.c133) (seg0 localhost.localdomain:40000 pid=2780 (cdbisp.c1475)
 DETAIL SQL statement "UPDATE pgagent.pga_job SET jobnextrun = NULL WHERE
jobenalbed AND jobid=$1"

 PL/pgSQL function "pga_schedule_trigger" line 10 at SQL statement
<http://postgresql.1045698.n5.nabble.com/file/n5756084/pgadminIII.jpg>



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