Cannot use external routine server site executor; reason <num>

  Explanation:  An attempt to perform  an  external  routine  task
  using  the  server site client executor failed.  This usually is
  an indication that either the executor process  has  terminated,
  or  there  is  insufficient  shared  memory for either a routine
  callout or a RCI callback from  a  routine.   The  reason  value
  represents a more specific indication of the failure.

  User Action:  For reasons 1 thru 9, check for sufficient quotas.
  For  reasons  10  thru  19,  increase  the value for environment
  variable RDMS$RTX_SHRMEM_PAGE_CNT as required.  For  reasons  20
  thru  29,  make sure the proper images have been installed.  For
  all other reasons, contact your  Oracle  support  representative
  for  assistance.   You  will  need  to provide a script allowing
  reproduction of the problem.