2012-12-28 22:56:35 [SEVERE] java.util.ConcurrentModificationException
2012-12-28 22:56:35 [SEVERE] 	at java.util.ArrayList.writeObject(ArrayList.java:713)
2012-12-28 22:56:35 [SEVERE] 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
2012-12-28 22:56:35 [SEVERE] 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
2012-12-28 22:56:35 [SEVERE] 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
2012-12-28 22:56:35 [SEVERE] 	at java.lang.reflect.Method.invoke(Method.java:601)
2012-12-28 22:56:35 [SEVERE] 	at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:975)
2012-12-28 22:56:35 [SEVERE] 	at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1480)
2012-12-28 22:56:35 [SEVERE] 	at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1416)
2012-12-28 22:56:35 [SEVERE] 	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174)
2012-12-28 22:56:35 [SEVERE] 	at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:346)
2012-12-28 22:56:35 [SEVERE] 	at pl.islandworld.SLAPI.save(SLAPI.java:17)
2012-12-28 22:56:35 [SEVERE] 	at pl.islandworld.IslandWorld.saveDatFiles(IslandWorld.java:698)
2012-12-28 22:56:35 [SEVERE] 	at pl.islandworld.IslandWorld$AutoSave.run(IslandWorld.java:851)
2012-12-28 22:56:35 [SEVERE] 	at org.bukkit.craftbukkit.v1_4_6.scheduler.CraftTask.run(CraftTask.java:53)
2012-12-28 22:56:35 [SEVERE] 	at org.bukkit.craftbukkit.v1_4_6.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:345)
2012-12-28 22:56:35 [SEVERE] 	at net.minecraft.server.v1_4_6.MinecraftServer.r(MinecraftServer.java:530)
2012-12-28 22:56:35 [SEVERE] 	at net.minecraft.server.v1_4_6.DedicatedServer.r(DedicatedServer.java:224)
2012-12-28 22:56:35 [SEVERE] 	at net.minecraft.server.v1_4_6.MinecraftServer.q(MinecraftServer.java:494)
2012-12-28 22:56:35 [SEVERE] 	at net.minecraft.server.v1_4_6.MinecraftServer.run(MinecraftServer.java:427)
2012-12-28 22:56:35 [SEVERE] 	at net.minecraft.server.v1_4_6.ThreadServerApplication.run(SourceFile:849)