Solved Removing from List in hashmap

Code:

13:44:56 [SEVERE] Could not pass event PlayerQuitEvent to mPvp v1
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
va:427)
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.jav
a:62)
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.j
ava:477)
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.j
ava:462)
        at net.minecraft.server.v1_5_R3.PlayerList.disconnect(PlayerList.java:25
6)
        at net.minecraft.server.v1_5_R3.PlayerConnection.a(PlayerConnection.java
:691)
        at net.minecraft.server.v1_5_R3.NetworkManager.b(NetworkManager.java:297
)
        at net.minecraft.server.v1_5_R3.PlayerConnection.d(PlayerConnection.java
:109)
        at net.minecraft.server.v1_5_R3.ServerConnection.b(SourceFile:35)
        at net.minecraft.server.v1_5_R3.DedicatedServerConnection.b(SourceFile:3
0)
        at net.minecraft.server.v1_5_R3.MinecraftServer.r(MinecraftServer.java:5
81)
        at net.minecraft.server.v1_5_R3.DedicatedServer.r(DedicatedServer.java:2
26)
        at net.minecraft.server.v1_5_R3.MinecraftServer.q(MinecraftServer.java:4
77)
        at net.minecraft.server.v1_5_R3.MinecraftServer.run(MinecraftServer.java
:410)
        at net.minecraft.server.v1_5_R3.ThreadServerApplication.run(SourceFile:5
73)
Caused by: java.lang.UnsupportedOperationException
        at java.util.AbstractList.remove(Unknown Source)
        at java.util.AbstractList$Itr.remove(Unknown Source)
        at java.util.AbstractCollection.remove(Unknown Source)
        at com.mcavengers.mpvp.Game.playerLeft(Game.java:65)
        at com.mcavengers.mpvp.events.PlayerController.onLeave(PlayerController.
java:22)
        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.ja
va:425)
        ... 14 more

This is my error ^.

What my code is:

Code:java

 
        if(mapDeelnemer.containsKey(player.getWorld().getName())){
            if(mapDeelnemer.get(player.getWorld().getName()).contains(player.getName())){
                mapDeelnemer.get(player.getWorld().getName()).remove(player.getName()); //ERROR!
            }
        }
 

Fixed it by using an ArrayList instead of a List.

EDIT by Moderator: merged posts, please use the edit button instead of double posting.