Server.log of CTF glitchs

Caused by: java.lang.ClassCastException: org.bukkit.craftbukkit.v1_5_R3.entity.CraftSkeleton cannot be cast to org.bukkit.entity.Player
	at net.askarian.MisterErwin.CTF.listener.CListener.onDamage(CListener.java:82)
	at sun.reflect.GeneratedMethodAccessor398.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:425)
	... 20 more
2013-06-09 09:52:24 [SEVERE] Could not pass event EntityDamageByEntityEvent to CTF v0.55
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_5_R3.event.CraftEventFactory.callEvent(CraftEventFactory.java:89)
	at org.bukkit.craftbukkit.v1_5_R3.event.CraftEventFactory.callEntityDamageEvent(CraftEventFactory.java:377)
	at org.bukkit.craftbukkit.v1_5_R3.event.CraftEventFactory.handleEntityDamageEvent(CraftEventFactory.java:402)
	at net.minecraft.server.v1_5_R3.EntityLiving.damageEntity(EntityLiving.java:677)
	at net.minecraft.server.v1_5_R3.EntityHuman.damageEntity(EntityHuman.java:684)
	at net.minecraft.server.v1_5_R3.EntityPlayer.damageEntity(EntityPlayer.java:358)
	at net.minecraft.server.v1_5_R3.EntityArrow.l_(EntityArrow.java:229)
	at net.minecraft.server.v1_5_R3.World.entityJoinedWorld(World.java:1355)
	at net.minecraft.server.v1_5_R3.WorldServer.entityJoinedWorld(WorldServer.java:614)
	at net.minecraft.server.v1_5_R3.World.playerJoinedWorld(World.java:1336)
	at net.minecraft.server.v1_5_R3.World.tickEntities(World.java:1224)
	at net.minecraft.server.v1_5_R3.WorldServer.tickEntities(WorldServer.java:480)
	at net.minecraft.server.v1_5_R3.MinecraftServer.r(MinecraftServer.java:563)
	at net.minecraft.server.v1_5_R3.DedicatedServer.r(DedicatedServer.java:226)
	at net.minecraft.server.v1_5_R3.MinecraftServer.q(MinecraftServer.java:477)
	at net.minecraft.server.v1_5_R3.MinecraftServer.run(MinecraftServer.java:410)
	at net.minecraft.server.v1_5_R3.ThreadServerApplication.run(SourceFile:573)
Caused by: java.lang.ClassCastException: org.bukkit.craftbukkit.v1_5_R3.entity.CraftSkeleton cannot be cast to org.bukkit.entity.Player
	at net.askarian.MisterErwin.CTF.listener.CListener.onDamage(CListener.java:82)
	at sun.reflect.GeneratedMethodAccessor398.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:425)
	... 20 more