segmented string <str> is already started

  Explanation:   You  issued  a  START_SEGMENTED_STRING  statement
  using a segmented string name for which a START_SEGMENTED_STRING
  statement   has   been   issued    without    a    corresponding
  END_SEGMENTED_STRING.

  User  Action:   Issue  END_SEGMENTED_STRING   or   use   another
  segmented string.