Custom Enchants Error Log

[SEVERE] Could not pass event EntityDamageByEntityEvent to Custom Enchantments v1.1a
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.TimedRegisteredListener.callEvent(TimedRegisteredListener.java:26)
	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:479)
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:464)
	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:681)
	at net.minecraft.server.v1_5_R3.EntityMonster.damageEntity(EntityMonster.java:39)
	at net.minecraft.server.v1_5_R3.EntityHuman.attack(EntityHuman.java:874)
	at net.minecraft.server.v1_5_R3.PlayerConnection.a(PlayerConnection.java:1118)
	at net.minecraft.server.v1_5_R3.Packet7UseEntity.handle(SourceFile:36)
	at org.spigotmc.netty.NettyNetworkManager.b(NettyNetworkManager.java:187)
	at net.minecraft.server.v1_5_R3.PlayerConnection.d(PlayerConnection.java:109)
	at net.minecraft.server.v1_5_R3.ServerConnection.b(SourceFile:35)
	at org.spigotmc.MultiplexingServerConnection.b(MultiplexingServerConnection.java:72)
	at net.minecraft.server.v1_5_R3.MinecraftServer.r(MinecraftServer.java:583)
	at net.minecraft.server.v1_5_R3.DedicatedServer.r(DedicatedServer.java:227)
	at net.minecraft.server.v1_5_R3.MinecraftServer.q(MinecraftServer.java:472)
	at net.minecraft.server.v1_5_R3.MinecraftServer.run(MinecraftServer.java:404)
	at net.minecraft.server.v1_5_R3.ThreadServerApplication.run(SourceFile:573)
Caused by: java.lang.NoSuchMethodError: org.bukkit.event.entity.EntityDamageByEntityEvent.getDamage()D
	at com.github.taiter.PlayerListener.onHit(PlayerListener.java:1699)
	at sun.reflect.GeneratedMethodAccessor686.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)
	... 21 more