Bug from Bukkit Plugin

[INFO] [UltimateArena] ERROR CREATING ARENA! REPORT TO DMULLOY2!
2013-05-07 17:12:14 [SEVERE] java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
2013-05-07 17:12:14 [SEVERE] 	at java.util.ArrayList.rangeCheck(Unknown Source)
2013-05-07 17:12:14 [SEVERE] 	at java.util.ArrayList.get(Unknown Source)
2013-05-07 17:12:14 [SEVERE] 	at com.orange451.UltimateArena.Arenas.Objects.ArenaCreator.saveArena(ArenaCreator.java:119)
2013-05-07 17:12:14 [SEVERE] 	at com.orange451.UltimateArena.Arenas.Objects.ArenaCreator.setDone(ArenaCreator.java:271)
2013-05-07 17:12:14 [SEVERE] 	at com.orange451.UltimateArena.UltimateArena.setDone(UltimateArena.java:596)
2013-05-07 17:12:14 [SEVERE] 	at com.orange451.UltimateArena.commands.PCommandSetDone.perform(PCommandSetDone.java:23)
2013-05-07 17:12:14 [SEVERE] 	at com.orange451.UltimateArena.commands.PBaseCommand.execute(PBaseCommand.java:32)
2013-05-07 17:12:14 [SEVERE] 	at com.orange451.UltimateArena.UltimateArena.handleCommand(UltimateArena.java:116)
2013-05-07 17:12:14 [SEVERE] 	at com.orange451.UltimateArena.UltimateArena.onCommand(UltimateArena.java:102)
2013-05-07 17:12:14 [SEVERE] 	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44)
2013-05-07 17:12:14 [SEVERE] 	at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:189)
2013-05-07 17:12:14 [SEVERE] 	at org.bukkit.craftbukkit.v1_5_R3.CraftServer.dispatchCommand(CraftServer.java:523)
2013-05-07 17:12:14 [SEVERE] 	at net.minecraft.server.v1_5_R3.PlayerConnection.handleCommand(PlayerConnection.java:965)
2013-05-07 17:12:14 [SEVERE] 	at net.minecraft.server.v1_5_R3.PlayerConnection.chat(PlayerConnection.java:883)
2013-05-07 17:12:14 [SEVERE] 	at net.minecraft.server.v1_5_R3.PlayerConnection.a(PlayerConnection.java:840)
2013-05-07 17:12:14 [SEVERE] 	at net.minecraft.server.v1_5_R3.Packet3Chat.handle(Packet3Chat.java:44)
2013-05-07 17:12:14 [SEVERE] 	at net.minecraft.server.v1_5_R3.NetworkManager.b(NetworkManager.java:292)
2013-05-07 17:12:14 [SEVERE] 	at net.minecraft.server.v1_5_R3.PlayerConnection.d(PlayerConnection.java:109)
2013-05-07 17:12:14 [SEVERE] 	at net.minecraft.server.v1_5_R3.ServerConnection.b(SourceFile:35)
2013-05-07 17:12:14 [SEVERE] 	at net.minecraft.server.v1_5_R3.DedicatedServerConnection.b(SourceFile:30)
2013-05-07 17:12:14 [SEVERE] 	at net.minecraft.server.v1_5_R3.MinecraftServer.r(MinecraftServer.java:581)
2013-05-07 17:12:14 [SEVERE] 	at net.minecraft.server.v1_5_R3.DedicatedServer.r(DedicatedServer.java:226)
2013-05-07 17:12:14 [SEVERE] 	at net.minecraft.server.v1_5_R3.MinecraftServer.q(MinecraftServer.java:477)
2013-05-07 17:12:14 [SEVERE] 	at net.minecraft.server.v1_5_R3.MinecraftServer.run(MinecraftServer.java:410)
2013-05-07 17:12:14 [SEVERE] 	at net.minecraft.server.v1_5_R3.ThreadServerApplication.run(SourceFile:573)