Library /sys$common/syshlp/dbg$help.hlb DEBUG, Messages, ILLVQUAL  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 illegal vector instruction qualifier specified at 'command_line'

    Facility: DEBUG, VMS Debugger

    Explanation: A vector instruction qualifier that is
    illegal for this vector instruction was specified during a
    DEPOSIT/INSTRUCTION command.

    User Action: Do not specify that illegal qualifier on that
    instruction.