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

 no active call frames

    Facility: DEBUG, VMS Debugger

    Explanation: The call stack cannot be displayed because your
    program has run to completion, and there are no call frames on
    the stack.

    User Action: None.