Monster Apocalypse Error #2

16:58:53 [SEVERE] Could not pass event EntityDamageEvent to Monster Apocalypse v
<14.0>
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
va:427)
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.jav
a:62)
        at org.bukkit.plugin.TimedRegisteredListener.callEvent(TimedRegisteredLi
stener.java:30)
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.j
ava:478)
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.j
ava:463)
        at org.bukkit.craftbukkit.v1_6_R2.event.CraftEventFactory.callEvent(Craf
tEventFactory.java:96)
        at org.bukkit.craftbukkit.v1_6_R2.event.CraftEventFactory.callEntityDama
geEvent(CraftEventFactory.java:400)
        at org.bukkit.craftbukkit.v1_6_R2.event.CraftEventFactory.handleEntityDa
mageEvent(CraftEventFactory.java:456)
        at net.minecraft.server.v1_6_R2.EntityLiving.damageEntity(EntityLiving.j
ava:643)
        at net.minecraft.server.v1_6_R2.EntityHuman.damageEntity(EntityHuman.jav
a:715)
        at net.minecraft.server.v1_6_R2.EntityPlayer.damageEntity(EntityPlayer.j
ava:379)
        at net.minecraft.server.v1_6_R2.EntityLiving.x(EntityLiving.java:155)
        at net.minecraft.server.v1_6_R2.Entity.l_(Entity.java:245)
        at net.minecraft.server.v1_6_R2.EntityLiving.l_(EntityLiving.java:1249)
        at net.minecraft.server.v1_6_R2.EntityHuman.l_(EntityHuman.java:157)
        at net.minecraft.server.v1_6_R2.EntityPlayer.h(EntityPlayer.java:224)
        at net.minecraft.server.v1_6_R2.PlayerConnection.a(PlayerConnection.java
:343)
        at net.minecraft.server.v1_6_R2.Packet10Flying.handle(SourceFile:136)
        at org.spigotmc.netty.NettyNetworkManager.b(NettyNetworkManager.java:230
)
        at net.minecraft.server.v1_6_R2.PlayerConnection.e(PlayerConnection.java
:116)
        at net.minecraft.server.v1_6_R2.ServerConnection.b(SourceFile:37)
        at org.spigotmc.netty.NettyServerConnection.b(NettyServerConnection.java
:125)
        at net.minecraft.server.v1_6_R2.MinecraftServer.t(MinecraftServer.java:5
92)
        at net.minecraft.server.v1_6_R2.DedicatedServer.t(DedicatedServer.java:2
39)
        at net.minecraft.server.v1_6_R2.MinecraftServer.s(MinecraftServer.java:4
81)
        at net.minecraft.server.v1_6_R2.MinecraftServer.run(MinecraftServer.java
:413)
        at net.minecraft.server.v1_6_R2.ThreadServerApplication.run(SourceFile:5
82)
Caused by: java.lang.NoClassDefFoundError: org/bukkit/craftbukkit/v1_5_R3/entity
/CraftArrow
        at blainicus.MonsterApocalypse.DamageListener.onEntityDamage(DamageListe
ner.java:82)
        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.ja
va:425)
        ... 26 more