Source lines not available for .0

    Facility: DEBUG, VMS Debugger

    Explanation: There were no source lines available for the current
    PC, so the debugger displayed the source lines for the calling
    routine. The source lines may be unavailable because the code
    associated with the current PC is not available (e.g. is in
    a VSI-supplied shareable image) or was compiled or linked
    /NODEBUG.

    User Action: If source modules is available, then recompile and
    relink the application using the /DEBUG qualifier.