Statistics API:  Unexpected error.

  Explanation:  An unexpected error has occurred during a call  to
  the statistics API.

  User Action:  Check that the error is not due to bad data  being
  passed  to  the  statistics API and that calls to the statistics
  API are being used correctly.  If the  problem  is  not  in  the
  client  application,  contact your Oracle support representative
  for assistance.