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

 error decoding instruction at current PC

    Facility: DEBUG, VMS Debugger

    Explanation: The debugger has encountered an error during
    decoding of an instruction at the current PC

    User Action: The address may be an entry mask, examine the
    instruction 2 bytes beyond the specified address.