помогите с ошибкой на RPG

[erik1401]

--- CRASH REPORT ---
Date: 2013-05-22 22:41:17
Applet creation
java.lang.ClassNotFoundException: net.minecraft.client.MinecraftApplet
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 java.lang.ClassLoader.loadClass(Unknown Source)
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.greencubes.downloader.GameUpdater.extendedUpdate(Unknown Source)
at org.greencubes.downloader.GameUpdater.createApplet(Unknown Source)
at org.greencubes.launcher.Launcher$1.run(Unknown Source)