The connection to adb is down, and a severe error has occured

    今天一测试妹子用eclipse时程序控制台输出，帮忙解决了顺便记录一下。

The connection to adb is down, and a severe error has occured.
You must restart adb and Eclipse.
Please ensure that adb is correctly located at 'D:\adt-bundle-windows-x86_64-20130219\sdk\platform-tools\adb.exe' and can be executed.

  发现妹子电脑里面有3个SDK，重复设置了环境变量（设置在前面的会被优先使用），删除无用的环境变量，问题得到解决。