[Server thread/ERROR]: Could not pass event EntityDamageByEntityEvent to InsaneMobs v1.9.6
org.bukkit.event.EventException
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:294) ~[spigot.jar:git-Spigot-1487]
	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot.jar:git-Spigot-1487]
	at org.bukkit.plugin.TimedRegisteredListener.callEvent(TimedRegisteredListener.java:47) ~[spigot.jar:git-Spigot-1487]
	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [spigot.jar:git-Spigot-1487]
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487) [spigot.jar:git-Spigot-1487]
	at org.bukkit.craftbukkit.v1_7_R3.event.CraftEventFactory.callEvent(CraftEventFactory.java:99) [spigot.jar:git-Spigot-1487]
	at org.bukkit.craftbukkit.v1_7_R3.event.CraftEventFactory.callEntityDamageEvent(CraftEventFactory.java:424) [spigot.jar:git-Spigot-1487]
	at org.bukkit.craftbukkit.v1_7_R3.event.CraftEventFactory.handleEntityDamageEvent(CraftEventFactory.java:451) [spigot.jar:git-Spigot-1487]
	at org.bukkit.craftbukkit.v1_7_R3.event.CraftEventFactory.handleNonLivingEntityDamageEvent(CraftEventFactory.java:495) [spigot.jar:git-Spigot-1487]
	at net.minecraft.server.v1_7_R3.EntityEnderCrystal.damageEntity(EntityEnderCrystal.java:63) [spigot.jar:git-Spigot-1487]
	at net.minecraft.server.v1_7_R3.EntityArrow.h(EntityArrow.java:243) [spigot.jar:git-Spigot-1487]
	at net.minecraft.server.v1_7_R3.World.entityJoinedWorld(World.java:1622) [spigot.jar:git-Spigot-1487]
	at net.minecraft.server.v1_7_R3.World.playerJoinedWorld(World.java:1598) [spigot.jar:git-Spigot-1487]
	at net.minecraft.server.v1_7_R3.World.tickEntities(World.java:1464) [spigot.jar:git-Spigot-1487]
	at net.minecraft.server.v1_7_R3.WorldServer.tickEntities(WorldServer.java:516) [spigot.jar:git-Spigot-1487]
	at net.minecraft.server.v1_7_R3.MinecraftServer.v(MinecraftServer.java:693) [spigot.jar:git-Spigot-1487]
	at net.minecraft.server.v1_7_R3.DedicatedServer.v(DedicatedServer.java:283) [spigot.jar:git-Spigot-1487]
	at net.minecraft.server.v1_7_R3.MinecraftServer.u(MinecraftServer.java:583) [spigot.jar:git-Spigot-1487]
	at net.minecraft.server.v1_7_R3.MinecraftServer.run(MinecraftServer.java:489) [spigot.jar:git-Spigot-1487]
	at net.minecraft.server.v1_7_R3.ThreadServerApplication.run(SourceFile:628) [spigot.jar:git-Spigot-1487]
Caused by: java.lang.ClassCastException: org.bukkit.craftbukkit.v1_7_R3.entity.CraftEnderCrystal cannot be cast to org.bukkit.entity.LivingEntity
	at me.sueswol.insanemobs.spawncommand.onDarkKnightDamage(spawncommand.java:788) ~[?:?]
	at sun.reflect.GeneratedMethodAccessor981.invoke(Unknown Source) ~[?:?]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0]
	at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.7.0]
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:292) ~[spigot.jar:git-Spigot-1487]
	... 19 more