BlockHunt Error

14.09 20:04:08 [Server] INFO ... 14 more
14.09 20:04:08 [Server] INFO at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:425)
14.09 20:04:08 [Server] INFO at java.lang.reflect.Method.invoke(Method.java:601)
14.09 20:04:08 [Server] INFO at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
14.09 20:04:08 [Server] INFO at sun.reflect.GeneratedMethodAccessor9.invoke(Unknown Source)
14.09 20:04:08 [Server] INFO at nl.Steffion.BlockHunt.Listeners.OnInventoryClickEvent.onInventoryClickEvent(OnInventoryClickEvent.java:179)
14.09 20:04:08 [Server] INFO at nl.Steffion.BlockHunt.Listeners.OnInventoryClickEvent.save(OnInventoryClickEvent.java:196)
14.09 20:04:08 [Server] INFO at nl.Steffion.BlockHunt.ArenaHandler.loadArenas(ArenaHandler.java:29)
14.09 20:04:08 [Server] INFO Caused by: java.lang.ClassCastException: org.bukkit.configuration.MemorySection cannot be cast to nl.Steffion.BlockHunt.Arena
14.09 20:04:08 [Server] INFO at net.minecraft.server.v1_6_R2.ThreadServerApplication.run(SourceFile:582)
14.09 20:04:08 [Server] INFO at net.minecraft.server.v1_6_R2.MinecraftServer.run(MinecraftServer.java:419)
14.09 20:04:08 [Server] INFO at net.minecraft.server.v1_6_R2.MinecraftServer.s(MinecraftServer.java:486)
14.09 20:04:08 [Server] INFO at net.minecraft.server.v1_6_R2.DedicatedServer.t(DedicatedServer.java:226)
14.09 20:04:08 [Server] INFO at net.minecraft.server.v1_6_R2.MinecraftServer.t(MinecraftServer.java:590)
14.09 20:04:08 [Server] INFO at net.minecraft.server.v1_6_R2.DedicatedServerConnection.b(SourceFile:30)
14.09 20:04:08 [Server] INFO at net.minecraft.server.v1_6_R2.ServerConnection.b(SourceFile:37)
14.09 20:04:08 [Server] INFO at net.minecraft.server.v1_6_R2.PlayerConnection.e(PlayerConnection.java:116)
14.09 20:04:08 [Server] INFO at net.minecraft.server.v1_6_R2.NetworkManager.b(NetworkManager.java:296)
14.09 20:04:08 [Server] INFO at net.minecraft.server.v1_6_R2.Packet102WindowClick.handle(SourceFile:31)
14.09 20:04:08 [Server] INFO at net.minecraft.server.v1_6_R2.PlayerConnection.a(PlayerConnection.java:1364)
14.09 20:04:08 [Server] INFO at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:462)
14.09 20:04:08 [Server] INFO at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:477)
14.09 20:04:08 [Server] INFO at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
14.09 20:04:08 [Server] INFO at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:427)
14.09 20:04:08 [Server] INFO org.bukkit.event.EventException
14.09 20:04:08 [Server] SEVERE Could not pass event InventoryClickEvent to BlockHunt v0.1.4_ALPHA