some error with bukkit and computercraft

java.lang.NoClassDefFoundError: ComputerCraft/net/minecraft/server/mod_CCTurtle (wrong name: net/minecraft/server/mod_CCTurtle)
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(Unknown Source)
    at java.security.SecureClassLoader.defineClass(Unknown Source)
    at java.net.URLClassLoader.defineClass(Unknown Source)
    at java.net.URLClassLoader.access$100(Unknown Source)
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Unknown Source)
    at cpw.mods.fml.common.Loader.loadModClass(Loader.java:440)
    at cpw.mods.fml.common.Loader.attemptFileLoad(Loader.java:497)
    at cpw.mods.fml.common.Loader.load(Loader.java:375)
    at cpw.mods.fml.common.Loader.loadMods(Loader.java:527)
    at cpw.mods.fml.server.FMLBukkitHandler.onPreLoad(FMLBukkitHandler.java:113)
    at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:118)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:426)
    at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)