2012-06-22 16:10:08 [SEVERE] Could not pass event EntityDamageByEntityEvent to DiamondNeverBreak
org.bukkit.event.EventException
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:303)
	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:459)
	at net.minecraft.server.EntityEnderDragon.b(EntityEnderDragon.java:402)
	at net.minecraft.server.EntityEnderDragon.e(EntityEnderDragon.java:288)
	at net.minecraft.server.EntityLiving.F_(EntityLiving.java:447)
	at net.minecraft.server.World.entityJoinedWorld(World.java:1264)
	at net.minecraft.server.WorldServer.entityJoinedWorld(WorldServer.java:106)
	at net.minecraft.server.World.playerJoinedWorld(World.java:1246)
	at net.minecraft.server.World.tickEntities(World.java:1153)
	at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:542)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:449)
	at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)
Caused by: java.lang.ClassCastException: org.bukkit.craftbukkit.entity.CraftEnderDragon cannot be cast to org.bukkit.entity.HumanEntity
	at me.crazy.dnb.DiamondNeverBreaks.entityDamageEntity(DiamondNeverBreaks.java:52)
	at sun.reflect.GeneratedMethodAccessor4.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:301)
	... 12 more