Error Log

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_R3.event.CraftEventFactory.callCreatureSpawnEvent(CraftEventFactory.java:239)
        at net.minecraft.server.v1_5_R3.World.addEntity(World.java:924)
        at net.minecraft.server.v1_5_R3.SpawnerCreature.spawnEntities(SpawnerCreature.java:159)
        at net.minecraft.server.v1_5_R3.WorldServer.doTick(WorldServer.java:186)
        at net.minecraft.server.v1_5_R3.MinecraftServer.r(MinecraftServer.java:555)
        at net.minecraft.server.v1_5_R3.DedicatedServer.r(DedicatedServer.java:226)
        at net.minecraft.server.v1_5_R3.MinecraftServer.q(MinecraftServer.java:477)
        at net.minecraft.server.v1_5_R3.MinecraftServer.run(MinecraftServer.java:410)
        at net.minecraft.server.v1_5_R3.ThreadServerApplication.run(SourceFile:573)
Caused by: java.lang.IllegalArgumentException: Location or entity class cannot be null
        at org.bukkit.craftbukkit.v1_5_R3.CraftWorld.spawn(CraftWorld.java:818)
        at org.bukkit.craftbukkit.v1_5_R3.CraftWorld.spawn(CraftWorld.java:792)
        at org.bukkit.craftbukkit.v1_5_R3.CraftWorld.spawnEntity(CraftWorld.java:339)
        at com.forgenz.mobmanager.common.util.ExtendedEntityType.spawnMob(ExtendedEntityType.java:216)
        at com.forgenz.mobmanager.abilities.abilities.AbstractSpawnAbility.addAbility(AbstractSpawnAbility.java:105)
        at com.forgenz.mobmanager.abilities.abilities.BirthSpawnAbility.addAbility(BirthSpawnAbility.java:50)
        at com.forgenz.mobmanager.abilities.abilities.AbilitySet.addAbility(AbilitySet.java:114)
        at com.forgenz.mobmanager.abilities.listeners.AbilitiesMobListener.addAbilities(AbilitiesMobListener.java:153)
        at com.forgenz.mobmanager.abilities.listeners.AbilitiesMobListener.onCreatureSpawn(AbilitiesMobListener.java:107)
        at sun.reflect.GeneratedMethodAccessor6.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.java:425)
        ... 12 more