EcoCreature error

2012-08-27 16:43:33 [SEVERE] Could not pass event CreatureKilledByPlayerEvent to ecoCreature
org.bukkit.event.EventException
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:332)
	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 se.crafted.chrisb.ecoCreature.listeners.DeathEventListener.onEntityDeath(DeathEventListener.java:43)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.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:330)
	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.event.CraftEventFactory.callEntityDeathEvent(CraftEventFactory.java:299)
	at net.minecraft.server.EntitySkeleton.dropDeathLoot(EntitySkeleton.java:111)
	at net.minecraft.server.EntityLiving.die(EntityLiving.java:767)
	at net.minecraft.server.EntitySkeleton.die(EntitySkeleton.java:68)
	at net.minecraft.server.EntityLiving.damageEntity(EntityLiving.java:663)
	at net.minecraft.server.EntityMonster.damageEntity(EntityMonster.java:38)
	at net.minecraft.server.EntityHuman.attack(EntityHuman.java:762)
	at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:1020)
	at net.minecraft.server.Packet7UseEntity.handle(SourceFile:36)
	at net.minecraft.server.NetworkManager.b(NetworkManager.java:276)
	at net.minecraft.server.NetServerHandler.d(NetServerHandler.java:109)
	at net.minecraft.server.ServerConnection.b(SourceFile:35)
	at net.minecraft.server.DedicatedServerConnection.b(SourceFile:30)
	at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:581)
	at net.minecraft.server.DedicatedServer.q(DedicatedServer.java:212)
	at net.minecraft.server.MinecraftServer.p(MinecraftServer.java:474)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:406)
	at net.minecraft.server.ThreadServerApplication.run(SourceFile:539)
Caused by: java.lang.NullPointerException
	at net.milkbowl.vault.economy.plugins.Economy_Craftconomy3.depositPlayer(Economy_Craftconomy3.java:150)
	at se.crafted.chrisb.ecoCreature.rewards.RewardManager.registerReward(RewardManager.java:411)
	at se.crafted.chrisb.ecoCreature.rewards.RewardManager.registerCreatureDeath(RewardManager.java:243)
	at se.crafted.chrisb.ecoCreature.listeners.KillEventListener.onCreatureKilledByPlayer(KillEventListener.java:23)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.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:330)
	... 30 more