[gridengine users] shepherd error "unknown variable job_pid"

[Gerard Henry]

hello all,
i have 6.2u5 but sge_execd is now from SGE6.2u5p2. Everything seems ok, 
but at the end of a job, i got this message:
Job 14940 caused action: none
  User        = webservd
  Queue       = solqual_dev at charybde.cmi.univ-mrs.fr
  Start Time  = 01/30/2012 09:22:44
  End Time    = 01/30/2012 09:36:41
failed before epilog:01/30/2012 09:36:41 [1437:28775]: unknown variable 
"job_pid"
Shepherd trace:
...
01/30/2012 09:36:41 [1437:28775]: job exited with exit status 0
01/30/2012 09:36:41 [1437:28775]: reaped "job" with pid 28781
01/30/2012 09:36:41 [1437:28775]: job exited not due to signal
01/30/2012 09:36:41 [1437:28775]: job exited with status 0
01/30/2012 09:36:41 [1437:28775]: now sending signal KILL to pid -28781
01/30/2012 09:36:41 [1437:28775]: writing usage file to "usage"
01/30/2012 09:36:41 [1437:28775]: no tasker to notify
01/30/2012 09:36:41 [1437:28775]: unknown variable "job_pid"

Shepherd error:
01/30/2012 09:36:41 [1437:28775]: unknown variable "job_pid"

Shepherd pe_hostfile:
charybde.cmi.univ-mrs.fr 1 solqual_dev at charybde.cmi.univ-mrs.fr UNDEFINED


i don't have epilog script on this queue. Anybody has an idea about this 
message?

thanks in advance,

gerard