进程中没有adb(如图),助手显示连接成功,但是devices中没有.求大神解答!!!

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:\Android\adt-bundle-windows-x86_64-20140702\sdk\platform-tools\adb.exe' and can be executed.