invalid defragmentation item list

    Explanation: The defragmentation list passed to DFG$DEFRAGMENT
    was invalid, because of one of the following:

    o  A call to DFG$DEFRAGMENT using a scheduler list that indicates
       the defragmentation list should be empty. For example, DFG$K_
       SHOW_SCRIPT must not have a defragmentation item list.

    o  Something was wrong with the semantics of the defragmentation
       item list, or a particular item descriptor was formatted
       improperly.

    User Action: If the call to DFG$DEFRAGMENT was from HP supplied
    software, submit an SPR. Otherwise, correct the calling program.