2012-07-27 13:55:52 [WARNING] Task of 'MobArena' generated an exception
java.lang.IllegalArgumentException: EntityType not instance of LivingEntity
	at org.apache.commons.lang.Validate.isTrue(Validate.java:157)
	at org.bukkit.craftbukkit.CraftWorld.spawnCreature(CraftWorld.java:336)
	at com.garbagemule.MobArena.waves.MACreature.spawn(MACreature.java:91)
	at com.garbagemule.MobArena.MASpawnThread.spawnWave(MASpawnThread.java:153)
	at com.garbagemule.MobArena.MASpawnThread.run(MASpawnThread.java:115)
	at org.bukkit.craftbukkit.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:126)
	at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:535)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:461)
	at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)