Bukkit

What steps will reproduce the problem?
1. add DungeonBuilder and launch server
2.
3.

What is the expected output? What do you see instead?
Register 1.8 begin to say : i got a prob, i am up to date ?
Without DungeonBuilder no error

What version of the product are you using?

0.97
Do you have an error log of what happened?

23:07:43 [SEVERE] Error occurred while enabling Register v1.8 (Is it up to date?)
java.lang.NoClassDefFoundError: org/bukkit/event/Event$Type
        at com.nijikokun.register.Register.onEnable(Register.java:70)
        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:217)
        at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:365)
        at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:381)
        at org.bukkit.craftbukkit.CraftServer.loadPlugin(CraftServer.java:265)
        at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:247)
        at net.minecraft.server.MinecraftServer.i(MinecraftServer.java:296)
        at net.minecraft.server.MinecraftServer.d(MinecraftServer.java:275)
        at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:225)
        at net.minecraft.server.DedicatedServer.init(DedicatedServer.java:140)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:378)
        at net.minecraft.server.ThreadServerApplication.run(SourceFile:539)
Caused by: java.lang.ClassNotFoundException: org.bukkit.event.Event$Type
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(Unknown Source)
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:41)
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:29)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        ... 12 more

Please provide any additional information below.

craftbukkit 2330 -1.3.1