Hello, i have been working on a minecraft map, but for some reason, every time i build in this one place in the world, when i log out, and then anytime when i log back in it has been erased! i thought it was because maybe it was a small bug and i started building again and it disappeared! i went into another place in the world it didn't erase it, the only way i can build there is with any minecraft world editer(mcedit, etc,) if you want any videos of this event happening, tell me, please solve this problem.
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The text was to long, so vist this link to see it:
https://docs.google.com/document/d/1VcGaVCCevFzqrmfBmlf9Tmpn9xC2vEqiBHT5O0v6iko/
[13:49:54 INFO]: Client> [13:49:54] [Client thread/ERROR]: Exception reading /Users/mama/Library/Application Support/minecraft/saves/Battleship2012-06-30-14-44/level.dat
That world is broken, maybe you've destroyed it by opening it in minecraft and at the same time at a second program.
Please attach the complete output of the "Development console" which can be found on the second tab of the launcher.
If the launcher closes after game start, please edit your profile and select "Launcher visibility" then, "Keep the launcher open".