Error

[22:33:02] [Server thread/ERROR]: Could not pass event EntityDamageByEntityEvent to PrivateDeathMessage v1.9b
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 net.minecraft.server.v1_7_R3.EntityLiving.damageEntity(EntityLiving.java:665) [Spigot.jar:git-Spigot-1487]
	at net.minecraft.server.v1_7_R3.EntityAnimal.damageEntity(SourceFile:145) [Spigot.jar:git-Spigot-1487]
	at net.minecraft.server.v1_7_R3.EntityHorse.damageEntity(EntityHorse.java:258) [Spigot.jar:git-Spigot-1487]
	at net.minecraft.server.v1_7_R3.EntityHuman.attack(EntityHuman.java:930) [Spigot.jar:git-Spigot-1487]
	at net.minecraft.server.v1_7_R3.PlayerConnection.a(PlayerConnection.java:1159) [Spigot.jar:git-Spigot-1487]
	at net.minecraft.server.v1_7_R3.PacketPlayInUseEntity.a(SourceFile:55) [Spigot.jar:git-Spigot-1487]
	at net.minecraft.server.v1_7_R3.PacketPlayInUseEntity.handle(SourceFile:10) [Spigot.jar:git-Spigot-1487]
	at net.minecraft.server.v1_7_R3.NetworkManager.a(NetworkManager.java:180) [Spigot.jar:git-Spigot-1487]
	at net.minecraft.server.v1_7_R3.ServerConnection.c(ServerConnection.java:81) [Spigot.jar:git-Spigot-1487]
	at net.minecraft.server.v1_7_R3.MinecraftServer.v(MinecraftServer.java:720) [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.CraftHorse cannot be cast to org.bukkit.entity.Player
	at a4.privatedeath.Main.onEntityDeath(Main.java:264) ~[?:?]
	at sun.reflect.GeneratedMethodAccessor371.invoke(Unknown Source) ~[?:?]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0_60]
	at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.7.0_60]
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:292) ~[Spigot.jar:git-Spigot-1487]
	... 21 more