VMS Help LBR Routines, LBR$OPEN, Condition Values Returned  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    LBR$_ERRCLOSE      Error. When the library was last modified
                       while opened for write access, the write
                       operation was interrupted. This left the
                       library in an inconsistent state.
    LBR$_ILLCREOPT     Requested create options not valid or not
                       supplied.
    LBR$_ILLCTL        Specified library control index not valid.
    LBR$_ILLFMT        Specified library format not valid.
    LBR$_ILLFUNC       Specified library function not valid.
    LBR$_LIBOPN        Specified library already open.
    LBR$_NOFILNAM      Error. The fns argument was not supplied or
                       the RMS NAM block was not filled in.
    LBR$_OLDLIBRARY    Success. The specified library has been
                       opened; the library was created with an old
                       library format.
    LBR$_OLDMISMCH     Requested library function conflicts with old
                       library type specified.
    LBR$_TYPMISMCH     Library type does not match the requested
                       type.