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

 no such tracepoint

    Facility: DEBUG, VMS Debugger

    Explanation: The CANCEL TRACE command specified an address that
    was not the address of a tracepoint.

    User Action: Use the SHOW TRACE command to display the current
    tracepoints and then cancel any that you want to cancel.