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

[这是window下的错误
2012-01-13 23:09:41 - HelloAndroid]The connection to adb is down, and a severe error has occured.
2012-01-13 23:09:41 - HelloAndroid]You must restart adb and Eclipse.
2012-01-13 23:09:41 - HelloAndroid]Please ensure that adb is correctly located at 'C:\Users\Mohit\Documents\AndroidSDK\tools\adb.exe' and can be executed.


这是ubuntu下的错误
2012-01-13 23:09:41 - HelloAndroid]The connection to adb is down, and a severe error has occured.
2012-01-13 23:09:41 - HelloAndroid]You must restart adb and Eclipse.
2012-01-13 23:09:41 - HelloAndroid]Please ensure that adb is correctly located at '/home/yanggf/android/android-sdk-linux/tools/adb' and can be executed.



解决办法：
wo options to solve this problem on windows:
Option 1:

    Close the eclipse, if it is running.
    Run the command prompt.
    Go to the tools location of the android sdk.
    run 'adb kill-server'
    then run 'adb start-server'.
    start the eclipse.

Option 2:

    Open the task manager.
    kill the adb process.
    start the eclipse.

Problem should be solved.