Time: 6/12/13 2:15 PM
Description: Exception in server tick loop

net.minecraft.server.v1_5_R3.ExceptionWorldConflict: Failed to check session lock, aborting
	at net.minecraft.server.v1_5_R3.WorldNBTStorage.checkSession(WorldNBTStorage.java:75)
	at net.minecraft.server.v1_5_R3.World.F(World.java:2725)
	at net.minecraft.server.v1_5_R3.WorldServer.a(WorldServer.java:809)
	at net.minecraft.server.v1_5_R3.WorldServer.save(WorldServer.java:793)
	at net.minecraft.server.v1_5_R3.MinecraftServer.saveChunks(MinecraftServer.java:324)
	at net.minecraft.server.v1_5_R3.MinecraftServer.q(MinecraftServer.java:478)
	at net.minecraft.server.v1_5_R3.MinecraftServer.run(MinecraftServer.java:406)
	at net.minecraft.server.v1_5_R3.ThreadServerApplication.run(SourceFile:573