signal SIGTRAP, code <num>, PC=!XA

  Explanation:   A  'hardware  fault'  signal  was  raised  as  an
  exception  in  response  to the arithmetic or software condition
  specified by the given code.  Decimal overflow,  Decimal  divide
  by  0,  Decimal  invalid  operand, Assertion error, Null pointer
  error, Stack overflow, String  length  error,  Substring  error,
  Range   error,  and  Subscript  [n]  range  error  are  specific
  conditions producing this signal.

  User Action:  Eliminate the cause of  the  error  condition  and
  retry the operation.