org.bukkit.command.CommandException: Unhandled exception executing command 'dxl' in plugin DungeonsXL v0.1

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via javacodegeeks.com by Unknown author

Causes : The Collection is internally modified, while a thread is iterating over it. OR after the creation of an iterator, the Collection is internally modified by any method other than the iterator’s own methods for removal and addition.

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via oracle.com by Unknown author

In order to avoid more than one threads accessing or modifying the same object, you can synchronize them over the object, in order to allow only one thread to manipulate it over the time

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org.bukkit.command.CommandException: Unhandled exception executing command 'dxl' in plugin DungeonsXL v0.1
at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:901)
at java.util.ArrayList$Itr.next(ArrayList.java:851)
at io.github.dre2n.dungeonsxl.dungeon.WorldConfig.load(WorldConfig.java:155)
at io.github.dre2n.dungeonsxl.dungeon.WorldConfig.(WorldConfig.java:71)
at io.github.dre2n.dungeonsxl.dungeon.game.GameWorld.checkRequirements(GameWorld.java:408)
at io.github.dre2n.dungeonsxl.command.PlayCommand.onExecute(PlayCommand.java:83)
at io.github.dre2n.dungeonsxl.listener.CommandListener.onCommand(CommandListener.java:51)
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44)
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141)
at org.bukkit.craftbukkit.v1_9_R1.CraftServer.dispatchCommand(CraftServer.java:645)
at net.minecraft.server.v1_9_R1.PlayerConnection.handleCommand(PlayerConnection.java:1342)
at net.minecraft.server.v1_9_R1.PlayerConnection.a(PlayerConnection.java:1177)
at net.minecraft.server.v1_9_R1.PacketPlayInChat.a(PacketPlayInChat.java:45)
at net.minecraft.server.v1_9_R1.PacketPlayInChat.a(PacketPlayInChat.java:1)
at net.minecraft.server.v1_9_R1.PlayerConnectionUtils$1.run(SourceFile:13)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at net.minecraft.server.v1_9_R1.SystemUtils.a(SourceFile:45)
at net.minecraft.server.v1_9_R1.MinecraftServer.D(MinecraftServer.java:721)
at net.minecraft.server.v1_9_R1.DedicatedServer.D(DedicatedServer.java:400)
at net.minecraft.server.v1_9_R1.MinecraftServer.C(MinecraftServer.java:660)
at net.minecraft.server.v1_9_R1.MinecraftServer.run(MinecraftServer.java:559)
at java.lang.Thread.run(Thread.java:745)

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