解决ADB server didn't ACK问题

今天把手机插到电脑上后，就是出现

The connection to adb is down, and a severe error has occured.
You must restart adb and Eclipse.

在命令行下运行 adb start-server

errors:

* daemon not running. starting it now *
ADB server didn't ACK
* failed to start daemon *

已经确认adb.exe的路径没有问题，重启了几次模拟器和eclipse还是不行，上网查了下资料~

解决办法：

（1）查看任务管理器，关闭所有adb.exe
（2）关掉豌豆荚进程