!-27 0 abortErr
!-21 0 badUnitErr
!-24 0 closeErr
!-17 0 controlErr
!-30 0 dceExtErr
!-26 0 dInstErr
!-25 0 dRemovErr
!-28 0 notOpenErr
!-23 0 openErr
!-19 0 readErr
!-18 0 statusErr
!-1021 0 tryAddNodeAgainErr
!-22 0 unitEmptyErr
!-29 0 unitTblFullErr
!-20 0 writeErr