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

 PC not allowed in context for operand number operand_number

    Facility: DEBUG, VMS Debugger

    Explanation: Using the PC as an operand in the entered
    instruction is not allowed.

    User Action: If the instruction was entered by the user, reenter
    the instruction, without using the PC in the operand. If not,
    then there may be an error in the user program instructions.