We have 5 active players.  Three of them had been on at different points yesterday morning.  Around noon everyone was off, and one player attempted to get on.  This player was removed from the world within 3 seconds with the statement "Disconnected due to world corruption      Try reopening the world or restoring it from a previous backup"  (the background is dirt) Neither of these options seem to work on the realm.  It has been almost a full day, and still no one is able to get on.                Minecraft and other worlds still work for everyone.   We created a duplicate realm, and tried to put a duplicate world in the new realm.  The world did not duplicate properly, and now a would that we have been working on since July seems lost to us.