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

报错信息：
The connection to adb is down, and a severe error has occured.
[2010-03-11 09:36:56 - HelloOPone] You must restart adb and Eclipse.
[2010-03-11 09:36:56 - HelloOPone] Please ensure that adb is correctly located at 'D:\OPhoneSDK_1.5
\platform-tools\adb.exe' and can be executed.

解决办法：
方法1：cmd中adb kill-server，然后adb -startserver 。
方法2：方法1不管用，那么在任务管理器中杀死adb.exe，然后重启Eclipse 。
方法3：方法1和2都不管用，那么查看最后一句报错中：platform-tools中是否有adb.exe（我的错误就是在相关路径下面没有platform-tools文件夹，所以我选择新建一个文件夹，并且把tools中的文件全部复制到platform-tools中）。

方法4：某个程序占用了adb端口，我的是 wandoujia_daemon.exe把端口占用了。