MA Error on 1.2.5-r4.1

21:16:38 [SEVERE] Could not pass event CreatureSpawnEvent to Monster Apocalypse
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
va:304)
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.jav
a:62)
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.j
ava:482)
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.j
ava:467)
        at org.bukkit.craftbukkit.event.CraftEventFactory.callCreatureSpawnEvent
(CraftEventFactory.java:226)
        at net.minecraft.server.World.addEntity(World.java:903)
        at net.minecraft.server.SpawnerCreature.spawnEntities(SpawnerCreature.ja
va:188)
        at net.minecraft.server.World.doTick(World.java:1757)
        at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:565)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:467)
        at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)
Caused by: java.lang.IllegalArgumentException: EntityType not instance of Living
Entity
        at org.apache.commons.lang.Validate.isTrue(Validate.java:157)
        at org.bukkit.craftbukkit.CraftWorld.spawnCreature(CraftWorld.java:336)
        at blainicus.MonsterApocalypse.SpawnListener.adjustedspawn(SpawnListener
.java:232)
        at blainicus.MonsterApocalypse.SpawnListener.onCreatureSpawn(SpawnListen
er.java:45)
        at sun.reflect.GeneratedMethodAccessor37.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
va:302)
        ... 10 more