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

 instruction operand syntax error for operand number operand_number

    Facility: DEBUG, VMS Debugger

    Explanation: The debugger encountered an error in one of the
    operands of an instruction.

    User Action: If the instruction was entered by the user, reenter
    the instruction, correcting the operand error. If not, then there
    may be an error in the user program instructions.