10:23:48 [SEVERE] java.util.ConcurrentModificationException
10:23:48 [SEVERE]   at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:782)
10:23:48 [SEVERE]   at java.util.ArrayList$Itr.next(ArrayList.java:754)
10:23:48 [SEVERE]   at net.minecraft.server.WorldServer.getTileEntities(WorldServer.java:546)
10:23:48 [SEVERE]   at net.minecraft.server.EntityPlayer.h_(EntityPlayer.java:165)
10:23:48 [SEVERE]   at net.minecraft.server.World.entityJoinedWorld(World.java:1245)
10:23:48 [SEVERE]   at net.minecraft.server.WorldServer.entityJoinedWorld(WorldServer.java:511)
10:23:48 [SEVERE]   at net.minecraft.server.World.playerJoinedWorld(World.java:1227)
10:23:48 [SEVERE]   at net.minecraft.server.World.tickEntities(World.java:1125)
10:23:48 [SEVERE]   at net.minecraft.server.WorldServer.tickEntities(WorldServer.java:428)
10:23:48 [SEVERE]   at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:547)
10:23:48 [SEVERE]   at net.minecraft.server.DedicatedServer.q(DedicatedServer.java:213)
10:23:48 [SEVERE]   at net.minecraft.server.MinecraftServer.p(MinecraftServer.java:474)
10:23:48 [SEVERE]   at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:406)
10:23:48 [SEVERE]   at net.minecraft.server.ThreadServerApplication.run(SourceFile:539)
10:23:48 [SEVERE] Encountered an unexpected exception ConcurrentModificationException
java.util.ConcurrentModificationException
    at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:782)
    at java.util.ArrayList$Itr.next(ArrayList.java:754)
    at net.minecraft.server.WorldServer.getTileEntities(WorldServer.java:546)
    at net.minecraft.server.EntityPlayer.h_(EntityPlayer.java:165)
    at net.minecraft.server.World.entityJoinedWorld(World.java:1245)
    at net.minecraft.server.WorldServer.entityJoinedWorld(WorldServer.java:511)
    at net.minecraft.server.World.playerJoinedWorld(World.java:1227)
    at net.minecraft.server.World.tickEntities(World.java:1125)
    at net.minecraft.server.WorldServer.tickEntities(WorldServer.java:428)
    at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:547)
    at net.minecraft.server.DedicatedServer.q(DedicatedServer.java:213)
    at net.minecraft.server.MinecraftServer.p(MinecraftServer.java:474)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:406)
    at net.minecraft.server.ThreadServerApplication.run(SourceFile:539)
10:23:49 [SEVERE] This crash report has been saved to: /home/ha11oga11o/Desktop/Minecraft/./crash-reports/crash-2012-10-23_10.23.49-server.txt