突然间就连不上模拟器了

[2016-06-05 20:49:21 - HelloWorld] ------------------------------

[2016-06-05 20:49:21 - HelloWorld] Android Launch!

[2016-06-05 20:49:21 - HelloWorld] The connection to adb is down, and a severe error has occured.

[2016-06-05 20:49:21 - HelloWorld] You must restart adb and Eclipse.

[2016-06-05 20:49:21 - HelloWorld] Please ensure that adb is correctly located at 'D:\ADT\adt-bundle-windows-x86_64-20140321\sdk\platform-tools\adb.exe' and can be executed.