Bukkit Error

14:19:43 [SEVERE] Could not pass event EntityTargetEvent to Moarbs v1.6.1
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_6_R1.event.CraftEventFactory.callEntityTargetEvent(CraftEventFactory.java:524)
	at net.minecraft.server.v1_6_R1.EntityExperienceOrb.l_(EntityExperienceOrb.java:72)
	at net.minecraft.server.v1_6_R1.World.entityJoinedWorld(World.java:1354)
	at net.minecraft.server.v1_6_R1.World.playerJoinedWorld(World.java:1335)
	at net.minecraft.server.v1_6_R1.World.tickEntities(World.java:1223)
	at net.minecraft.server.v1_6_R1.WorldServer.tickEntities(WorldServer.java:480)
	at net.minecraft.server.v1_6_R1.MinecraftServer.t(MinecraftServer.java:573)
	at net.minecraft.server.v1_6_R1.DedicatedServer.t(DedicatedServer.java:226)
	at net.minecraft.server.v1_6_R1.MinecraftServer.s(MinecraftServer.java:487)
	at net.minecraft.server.v1_6_R1.MinecraftServer.run(MinecraftServer.java:420)
	at net.minecraft.server.v1_6_R1.ThreadServerApplication.run(SourceFile:582)
Caused by: java.lang.ClassCastException: org.bukkit.craftbukkit.v1_6_R1.entity.CraftExperienceOrb cannot be cast to org.bukkit.entity.LivingEntity
	at netherlands.BEQUEEE.Moarbs.main.Ghostwalk(main.java:369)
	at sun.reflect.GeneratedMethodAccessor212.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)