2013-03-26 12:00:15 [SEVERE] Could not pass event CreatureSpawnEvent to Monster Apocalypse v<0.0.1>
org.bukkit.event.EventException
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:427)
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:477)
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:462)
at org.bukkit.craftbukkit.v1_5_R1.event.CraftEventFactory.callCreatureSpawnEvent(CraftEventFactory.java:227)
at net.minecraft.server.v1_5_R1.World.addEntity(World.java:925)
at net.minecraft.server.v1_5_R1.SpawnerCreature.spawnEntities(SpawnerCreature.java:159)
at net.minecraft.server.v1_5_R1.WorldServer.doTick(WorldServer.java:168)
at net.minecraft.server.v1_5_R1.MinecraftServer.r(MinecraftServer.java:554)
at net.minecraft.server.v1_5_R1.DedicatedServer.r(DedicatedServer.java:225)
at net.minecraft.server.v1_5_R1.MinecraftServer.q(MinecraftServer.java:476)
at net.minecraft.server.v1_5_R1.MinecraftServer.run(MinecraftServer.java:409)
at net.minecraft.server.v1_5_R1.ThreadServerApplication.run(SourceFile:573)
Caused by: java.lang.NoClassDefFoundError: org/bukkit/craftbukkit/v1_4_R1/entity/CraftSkeleton
at blainicus.MonsterApocalypse.MonsterApocalypse.getMobName(MonsterApocalypse.java:1879)
at blainicus.MonsterApocalypse.healthmanager.addmob(healthmanager.java:46)
at blainicus.MonsterApocalypse.SpawnListener.setmobproperties(SpawnListener.java:382)
at blainicus.MonsterApocalypse.SpawnListener.onCreatureSpawn(SpawnListener.java:49)
at sun.reflect.GeneratedMethodAccessor28.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:425)
... 12 more