08:42:13 [SEVERE] Could not pass event PlayerJoinEvent to iChatPlayerList v0.7
org.bukkit.event.EventException
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:363)
	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:477)
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:462)
	at gm.c(ServerConfigurationManager.java:263)
	at gm.a(ServerConfigurationManager.java:174)
	at it.completeConnection(NetLoginHandler.java:209)
	at cpw.mods.fml.common.network.FMLNetworkHandler.handleClientConnection(FMLNetworkHandler.java:157)
	at cpw.mods.fml.common.network.FMLNetworkHandler.onConnectionReceivedFromClient(FMLNetworkHandler.java:111)
	at it.d(NetLoginHandler.java:191)
	at it.c(NetLoginHandler.java:82)
	at hu.a(ServerListenThread.java:58)
	at ht.b(DedicatedServerListenThread.java:33)
	at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:869)
	at ho.r(DedicatedServer.java:309)
	at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:745)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:632)
	at fy.run(ThreadMinecraftServer.java:16)
Caused by: java.lang.IllegalArgumentException: ?7sirmagu is already assigned as a player list name for someone
	at org.bukkit.craftbukkit.v1_4_R1.entity.CraftPlayer.setPlayerListName(CraftPlayer.java:175)
	at com.worldcretornica.ichatplayerlist.iChatPlayerList.addPlayerToList(iChatPlayerList.java:273)
	at com.worldcretornica.ichatplayerlist.PlayerLoginListener.onPlayerJoin(PlayerLoginListener.java:104)
	at sun.reflect.GeneratedMethodAccessor284.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:601)
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:361)
	... 17 more