MCP无法启动client...

fsz1987

我下了最新的MCP v4.4,使用的是minecraftlauncher 2.1 下载的 1.8.1原版minecraft;能成功的decompile recompile 并且 reobfuscate
但是一旦运行startclient就出错,提示:

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== MCP v4.4 ==
[21:54] java.lang.NoClassDefFoundError: MCP/StartMods
[21:54] Caused by: java.lang.ClassNotFoundException: MCP.StartMods
[21:54] at java.net.URLClassLoader$1.run(Unknown Source)
[21:54] at java.security.AccessController.doPrivileged(Native Method)
[21:54] at java.net.URLClassLoader.findClass(Unknown Source)
[21:54] at java.lang.ClassLoader.loadClass(Unknown Source)
[21:54] at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
[21:54] at java.lang.ClassLoader.loadClass(Unknown Source)
[21:54] Could not find the main class: MCP.StartMods.  Program will exit.
[21:54] Exception in thread "main"
java.lang.NoClassDefFoundError: MCP/StartMods
Caused by: java.lang.ClassNotFoundException: MCP.StartMods
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)
Could not find the main class: MCP.StartMods.  Program will exit.
Exception in thread "main"

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按doc里说的先运行cleanup然后重做也没用,找了好久没找到解决方法.
刚开始学做minecraft mod,求教各位mod前辈有没有解决办法