Bukkit

I am tested on modpack FTB Direwolf v2 v1.1.3

error:

2013-12-05 23:17:05 [SEVERE] Could not pass event EntityPortalEvent to NoPortalEntityTransport v1.0.0
org.bukkit.event.EventException
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:363)
    at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
    at org.bukkit.plugin.TimedRegisteredListener.callEvent(TimedRegisteredListener.java:31)
    at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:479)
    at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:464)
    at net.minecraft.entity.Entity.func_71027_c(Entity.java:2614)
    at net.minecraft.entity.item.EntityItem.func_71027_c(EntityItem.java:502)
    at net.minecraft.entity.Entity.func_70030_z(Entity.java:527)
    at net.minecraft.entity.Entity.func_70071_h_(Entity.java:479)
    at net.minecraft.entity.item.EntityItem.func_70071_h_(EntityItem.java:116)
    at net.minecraft.world.World.func_72866_a(World.java:2522)
    at net.minecraft.world.WorldServer.func_72866_a(WorldServer.java:941)
    at net.minecraft.world.World.func_72870_g(World.java:2475)
    at net.minecraft.world.World.func_72939_s(World.java:2287)
    at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:806)
    at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:838)
    at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:320)
    at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:732)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:614)
    at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:573)
Caused by: java.lang.NoClassDefFoundError: org/bukkit/craftbukkit/v1_6_R2/entity/CraftItem
    at com.cyprias.NoPortalEntityTransport.listeners.EntityListener.onEntityPortal(EntityListener.java:23)
    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.java:361)
    ... 19 more

Having never used that mod, looks like it's using a different version of bukkit then the plugin was compiled for. What version of bukkit is it using? I might be able to add support.