2012-07-02 13:59:08 [INFO] ** Saving Server **2012-07-02 13:59:08 [INFO] [AutoSaveWorld] ** Saving Server **2012-07-02 13:59:08 [WARNING] Task of 'AutoSaveWorld' generated an exceptionnet.minecraft.server.WorldConlictException: Failed to check session lock, aborting2012-07-02 13:59:08 [SEVERE] net.minecraft.server.WorldConlictException: Failed to check session lock, aborting2012-07-02 13:59:08 [SEVERE]    at net.minecraft.server.WorldNBTStorage.checkSession(WorldNBTStorage.java:74)
2012-07-02 13:59:08 [SEVERE]    at net.minecraft.server.World.m(World.java:2718)2012-07-02 13:59:08 [SEVERE]    at net.minecraft.server.World.A(World.java:261)
2012-07-02 13:59:08 [SEVERE]    at net.minecraft.server.World.save(World.java:251)
2012-07-02 13:59:08 [SEVERE]    at net.minecraft.server.World.doTick(World.java:1750)2012-07-02 13:59:08 [SEVERE]    at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:554)
2012-07-02 13:59:08 [SEVERE]    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:459)
2012-07-02 13:59:08 [SEVERE]    at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)
2012-07-02 13:59:08 [SEVERE] Unexpected exception
net.minecraft.server.WorldConlictException: Failed to check session lock, aborting