exception C User, code <num>, <num> param(s) (17XA)

  Explanation:  An 'C User' exception  with  the  given  code  and
  optional  parameters  was raised in response to an arithmetic or
  software condition.

  User Action:  Eliminate the cause of  the  error  condition  and
  retry  the  operation.   BASEs 3811-3849 Reserved for future OSF
  exception types