Помогите Краш при прописывании /difficulty

Помогите, пожалуйста. При прописывании команды /difficulty сервер начинает крашится.
Краш вылетает такого формата:

Код:

20.09 19:18:42 [Server] INFO ... 7 more
20.09 19:18:42 [Server] INFO at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:189)
20.09 19:18:42 [Server] INFO at org.bukkit.command.defaults.DifficultyCommand.execute(DifficultyCommand.java:48)
20.09 19:18:42 [Server] INFO at java.util.ArrayList.get(ArrayList.java:411)
20.09 19:18:42 [Server] INFO at java.util.ArrayList.rangeCheck(ArrayList.java:635)
20.09 19:18:42 [Server] INFO Caused by: java.lang.IndexOutOfBoundsException: Index: 2, Size: 2
20.09 19:18:42 [Server] INFO at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:573)
20.09 19:18:42 [Server] INFO at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:614)
20.09 19:18:42 [Server] INFO at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:732)
20.09 19:18:42 [Server] INFO at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:321)
20.09 19:18:42 [Server] INFO at net.minecraft.server.dedicated.DedicatedServer.func_71333_ah(DedicatedServer.java:364)
20.09 19:18:42 [Server] INFO at org.bukkit.craftbukkit.v1_5_R3.CraftServer.dispatchServerCommand(CraftServer.java:538)
20.09 19:18:42 [Server] INFO at org.bukkit.craftbukkit.v1_5_R3.CraftServer.dispatchCommand(CraftServer.java:555)
20.09 19:18:42 [Server] INFO at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:193)
20.09 19:18:42 [Server] INFO org.bukkit.command.CommandException: Unhandled exception executing 'difficulty 1' in org.bukkit.command.defaults.DifficultyCommand(difficulty)

 

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