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java.util.ConcurrentModificationException: 	at java.util.HashMap$HashIterator.nextEntry(Unknown Source)	at java.util.HashMap$KeyIterator.next(Unknown Source)	at SkyPvPTobiasS.ScoreBoardClass.onWorldChange(ScoreBoardClass.java:165)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306)	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502)	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487)	at net.minecraft.server.v1_8_R3.PlayerList.moveToWorld(PlayerList.java:628)	at org.bukkit.craftbukkit.v1_8_R3.entity.CraftPlayer.teleport(CraftPlayer.java:471)	at org.bukkit.craftbukkit.v1_8_R3.entity.CraftEntity.teleport(CraftEntity.java:226)	at com.onarandombox.MultiverseCore.utils.SimpleSafeTTeleporter.safelyTeleport(SimpleSafeTTeleporter.java:215)	at com.onarandombox.MultiversePortals.listeners.PlayerListenerHelper.performTeleport(PlayerListenerHelper.java:44)	at com.onarandombox.MultiversePortals.listeners.MVPPlayerMoveListener.playerMove(MVPPlayerMoveListener.java:137)	at sun.reflect.GeneratedMethodAccessor141.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306)	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502)	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487)	at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:270)	at net.minecraft.server.v1_8_R3.PacketPlayInFlying.a(SourceFile:126)	at net.minecraft.server.v1_8_R3.PacketPlayInFlying$PacketPlayInPosition.a(SourceFile:57)	at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13)	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)	at java.util.concurrent.FutureTask.run(Unknown Source)	at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:44)	at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:715)	at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374)	at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:654)	at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:557)	at java.lang.Thread.run(Unknown Source)