[INFO] [MobArena] Enabling MobArena v0.94.4.79
2012-08-20 16:03:14 [WARNING] [MobArena] Vault was not found. Economy rewards will not work!
2012-08-20 16:03:14 [SEVERE] Error occurred while enabling MobArena v0.94.4.79 (Is it up to date?)
java.lang.IllegalArgumentException: Block must be a sign!
    at com.garbagemule.MobArena.leaderboards.Leaderboard.<init>(Leaderboard.java:64)
    at com.garbagemule.MobArena.ArenaImpl.<init>(ArenaImpl.java:137)
    at com.garbagemule.MobArena.ArenaMasterImpl.loadArena(ArenaMasterImpl.java:524)
    at com.garbagemule.MobArena.ArenaMasterImpl.loadArenas(ArenaMasterImpl.java:494)
    at com.garbagemule.MobArena.ArenaMasterImpl.initialize(ArenaMasterImpl.java:243)
    at com.garbagemule.MobArena.MobArena.onEnable(MobArena.java:81)
    at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:217)
    at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:337)
    at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:381)
    at org.bukkit.craftbukkit.CraftServer.loadPlugin(CraftServer.java:263)
    at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:245)
    at net.minecraft.server.MinecraftServer.i(MinecraftServer.java:292)
    at net.minecraft.server.MinecraftServer.d(MinecraftServer.java:271)
    at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:221)
    at net.minecraft.server.DedicatedServer.init(DedicatedServer.java:140)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:376)
    at net.minecraft.server.ThreadServerApplication.run(SourceFile:539)