Simplelevels

17:35:45 [SEVERE] Could not pass event EntityDamageByEntityEvent to SimpleLevels
 v3.0
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.SimplePluginManager.fireEvent(SimplePluginManager.j
ava:477)
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.j
ava:462)
        at org.bukkit.craftbukkit.v1_5_R3.event.CraftEventFactory.callEvent(Craf
tEventFactory.java:93)
        at org.bukkit.craftbukkit.v1_5_R3.event.CraftEventFactory.callEntityDama
geEvent(CraftEventFactory.java:381)
        at org.bukkit.craftbukkit.v1_5_R3.event.CraftEventFactory.handleEntityDa
mageEvent(CraftEventFactory.java:406)
        at net.minecraft.server.v1_5_R3.EntityLiving.damageEntity(EntityLiving.j
ava:677)
        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
:1107)
        at net.minecraft.server.v1_5_R3.Packet7UseEntity.handle(SourceFile:36)
        at net.minecraft.server.v1_5_R3.NetworkManager.b(NetworkManager.java:292
)
        at net.minecraft.server.v1_5_R3.PlayerConnection.d(PlayerConnection.java
:115)
        at net.minecraft.server.v1_5_R3.ServerConnection.b(SourceFile:35)
        at net.minecraft.server.v1_5_R3.DedicatedServerConnection.b(SourceFile:3
0)
        at net.minecraft.server.v1_5_R3.MinecraftServer.r(MinecraftServer.java:5
81)
        at net.minecraft.server.v1_5_R3.DedicatedServer.r(DedicatedServer.java:2
26)
        at net.minecraft.server.v1_5_R3.MinecraftServer.q(MinecraftServer.java:4
77)
        at net.minecraft.server.v1_5_R3.MinecraftServer.run(MinecraftServer.java
:410)
        at net.minecraft.server.v1_5_R3.ThreadServerApplication.run(SourceFile:5
73)
Caused by: java.lang.NoSuchMethodError: org.bukkit.event.entity.EntityDamageByEn
tityEvent.getDamage()D
        at gmail.theultimatebudgie.simpleLevels.SimpleLevelsDamageListener.onEnt
ityDamageByEntity(SimpleLevelsDamageListener.java:36)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.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)
        ... 20 more