DispenserRefill Exception event 0001

2013-08-16 21:41:34 [SEVERE] Could not pass event BlockDispenseEvent to DispenserRefill v1.0.0
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.SimplePluginManager.fireEvent(SimplePluginManager.java:477)
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:462)
	at net.minecraft.server.v1_6_R2.DispenseBehaviorItem.a(DispenseBehaviorItem.java:57)
	at net.minecraft.server.v1_6_R2.DispenseBehaviorItem.b(DispenseBehaviorItem.java:26)
	at net.minecraft.server.v1_6_R2.DispenseBehaviorItem.a(DispenseBehaviorItem.java:13)
	at net.minecraft.server.v1_6_R2.BlockDispenser.dispense(BlockDispenser.java:82)
	at net.minecraft.server.v1_6_R2.BlockDispenser.a(BlockDispenser.java:110)
	at net.minecraft.server.v1_6_R2.WorldServer.a(WorldServer.java:532)
	at net.minecraft.server.v1_6_R2.WorldServer.doTick(WorldServer.java:199)
	at net.minecraft.server.v1_6_R2.MinecraftServer.t(MinecraftServer.java:564)
	at net.minecraft.server.v1_6_R2.DedicatedServer.t(DedicatedServer.java:226)
	at net.minecraft.server.v1_6_R2.MinecraftServer.s(MinecraftServer.java:486)
	at net.minecraft.server.v1_6_R2.MinecraftServer.run(MinecraftServer.java:419)
	at net.minecraft.server.v1_6_R2.ThreadServerApplication.run(SourceFile:582)
Caused by: java.lang.NoClassDefFoundError: org/bukkit/craftbukkit/block/CraftDispenser
	at de.akkarin.DispenserRefill.DispenserRefillWorldListener.onDispense(DispenserRefillWorldListener.java:64)
	at sun.reflect.GeneratedMethodAccessor83.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)
	... 15 more