2011-09-29 09:41:47 [SEVERE] Could not pass event CREATURE_SPAWN to RangedWolves
java.lang.NoClassDefFoundError: com/garbagemule/MobArena/ArenaMaster
        at com.ACStache.RangedWolves.RWEntityListener.onCreatureSpawn(RWEntityListener.java:295)
        at org.bukkit.plugin.java.JavaPluginLoader$70.execute(JavaPluginLoader.java:733)
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:58)
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:339)
        at org.bukkit.craftbukkit.event.CraftEventFactory.callCreatureSpawnEvent(CraftEventFactory.java:242)
        at net.minecraft.server.World.addEntity(World.java:849)
        at net.minecraft.server.SpawnerCreature.a(SpawnerCreature.java:286)
        at net.minecraft.server.ChunkProviderGenerate.getChunkAt(SourceFile:486)
        at org.bukkit.craftbukkit.generator.NormalChunkGenerator.getChunkAt(NormalChunkGenerator.java:45)
        at net.minecraft.server.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:165)
        at net.minecraft.server.Chunk.a(Chunk.java:825)
        at net.minecraft.server.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:96)
        at org.bukkit.craftbukkit.CraftWorld.getChunkAt(CraftWorld.java:96)
        at org.bukkit.craftbukkit.CraftWorld.getBlockAt(CraftWorld.java:64)
        at org.bukkit.craftbukkit.block.CraftBlock.getRelative(CraftBlock.java:121)
        at org.bukkit.event.block.BlockFromToEvent.getToBlock(BlockFromToEvent.java:39)
        at com.sk89q.worldguard.bukkit.WorldGuardBlockListener.onBlockFromTo(WorldGuardBlockListener.java:230)
        at org.bukkit.plugin.java.JavaPluginLoader$33.execute(JavaPluginLoader.java:469)
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:58)
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:339)
        at net.minecraft.server.BlockFlowing.a(BlockFlowing.java:134)
        at net.minecraft.server.World.i(World.java:1891)
        at net.minecraft.server.World.doTick(World.java:1638)
        at net.minecraft.server.MinecraftServer.h(MinecraftServer.java:461)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:374)
        at net.minecraft.server.ThreadServerApplication.run(SourceFile:417)
Caused by: java.lang.ClassNotFoundException: com.garbagemule.MobArena.ArenaMaster
        at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:36)
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:24)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
        ... 26 more