the debugger could not open the user interface definition file,
 SYS$LIBRARY:DEBUGUIL.UID.

    Facility: DEBUG, VMS Debugger

    Explanation: The debugger could not find one of the necessary
    file to support the DECWindows interface, preventing the debugger
    from continuing this session.

    User Action: Check for the exsistance and accessability of
    SYS$LIBRARY:DEBUGUIL.UID. For further assistance and information
    on this probelm check with your system manager.