Error occurred while enabling ArenaSpleef v1.3.5 (Is it up to date?)
java.lang.NoSuchMethodError: mc.alk.arena.BattleArena.registerMatchType(Lorg/bukkit/plugin/java/JavaPlugin;Ljava/lang/String;Ljava/lang/String;Ljava/lang/Class;Lmc/alk/arena/executors/BAExecutor;)V
	at mc.arena.spleef.ArenaSpleef.onEnable(ArenaSpleef.java:25)
	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:217)
	at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:457)
	at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:381)
	at org.bukkit.craftbukkit.v1_4_R1.CraftServer.loadPlugin(CraftServer.java:282)
	at org.bukkit.craftbukkit.v1_4_R1.CraftServer.enablePlugins(CraftServer.java:264)
	at net.minecraft.server.v1_4_R1.MinecraftServer.j(MinecraftServer.java:321)
	at net.minecraft.server.v1_4_R1.MinecraftServer.e(MinecraftServer.java:300)
	at net.minecraft.server.v1_4_R1.MinecraftServer.a(MinecraftServer.java:259)
	at net.minecraft.server.v1_4_R1.DedicatedServer.init(DedicatedServer.java:149)
	at net.minecraft.server.v1_4_R1.MinecraftServer.run(MinecraftServer.java:399)
	at net.minecraft.server.v1_4_R1.ThreadServerApplication.run(SourceFile:849)