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

 no such breakpoint

    Facility: DEBUG, VMS Debugger

    Explanation: The CANCEL BREAK command specified an address that
    is not the address of a breakpoint.

    User Action: Use the SHOW BREAK command to find the location of
    the current breakpoints, and then cancel any of these breakpoints
    that you want to cancel.