Bukkit

Hi, Sometimes I get this error in console, how to remove it?

Version Hungergames v3.1 on Spigot 1543 1.7.9
I use Multiverse-Core if  it is important.

[Server thread/ERROR]: Could not pass event EntityDamageByEntityEvent to HungerGames v3.1
org.bukkit.event.EventException
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:299) ~[custom_server.jar:git-Spigot-1543]
    at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[custom_server.jar:git-Spigot-1543]
    at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [custom_server.jar:git-Spigot-1543]
    at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487) [custom_server.jar:git-Spigot-1543]
    at org.bukkit.craftbukkit.v1_7_R3.event.CraftEventFactory.callEvent(CraftEventFactory.java:109) [custom_server.jar:git-Spigot-1543]
    at org.bukkit.craftbukkit.v1_7_R3.event.CraftEventFactory.callEntityDamageEvent(CraftEventFactory.java:550) [custom_server.jar:git-Spigot-1543]
    at org.bukkit.craftbukkit.v1_7_R3.event.CraftEventFactory.handleEntityDamageEvent(CraftEventFactory.java:463) [custom_server.jar:git-Spigot-1543]
    at org.bukkit.craftbukkit.v1_7_R3.event.CraftEventFactory.handleLivingEntityDamageEvent(CraftEventFactory.java:572) [custom_server.jar:git-Spigot-1543]
    at net.minecraft.server.v1_7_R3.EntityLiving.d(EntityLiving.java:1009) [custom_server.jar:git-Spigot-1543]
    at net.minecraft.server.v1_7_R3.EntityHuman.d(EntityHuman.java:810) [custom_server.jar:git-Spigot-1543]
    at net.minecraft.server.v1_7_R3.EntityLiving.damageEntity(EntityLiving.java:683) [custom_server.jar:git-Spigot-1543]
    at net.minecraft.server.v1_7_R3.EntityHuman.damageEntity(EntityHuman.java:751) [custom_server.jar:git-Spigot-1543]
    at net.minecraft.server.v1_7_R3.EntityPlayer.damageEntity(EntityPlayer.java:468) [custom_server.jar:git-Spigot-1543]
    at net.minecraft.server.v1_7_R3.EntityArrow.h(EntityArrow.java:243) [custom_server.jar:git-Spigot-1543]
    at net.minecraft.server.v1_7_R3.World.entityJoinedWorld(World.java:1602) [custom_server.jar:git-Spigot-1543]
    at net.minecraft.server.v1_7_R3.World.playerJoinedWorld(World.java:1577) [custom_server.jar:git-Spigot-1543]
    at net.minecraft.server.v1_7_R3.World.tickEntities(World.java:1442) [custom_server.jar:git-Spigot-1543]
    at net.minecraft.server.v1_7_R3.WorldServer.tickEntities(WorldServer.java:516) [custom_server.jar:git-Spigot-1543]
    at net.minecraft.server.v1_7_R3.MinecraftServer.v(MinecraftServer.java:703) [custom_server.jar:git-Spigot-1543]
    at net.minecraft.server.v1_7_R3.DedicatedServer.v(DedicatedServer.java:284) [custom_server.jar:git-Spigot-1543]
    at net.minecraft.server.v1_7_R3.MinecraftServer.u(MinecraftServer.java:584) [custom_server.jar:git-Spigot-1543]
    at net.minecraft.server.v1_7_R3.MinecraftServer.run(MinecraftServer.java:490) [custom_server.jar:git-Spigot-1543]
    at net.minecraft.server.v1_7_R3.ThreadServerApplication.run(SourceFile:628) [custom_server.jar:git-Spigot-1543]
Caused by: java.lang.ClassCastException: org.bukkit.craftbukkit.v1_7_R3.projectiles.CraftBlockProjectileSource cannot be cast to org.bukkit.entity.Entity
    at me.minebuilders.hg.listeners.GameListener.onAttack(GameListener.java:202) ~[?:?]
    at sun.reflect.GeneratedMethodAccessor302.invoke(Unknown Source) ~[?:?]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.7.0_76]
    at java.lang.reflect.Method.invoke(Method.java:606) ~[?:1.7.0_76]
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:296) ~[custom_server.jar:git-Spigot-1543]
    ... 22 more