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

If you get the error in Eclipse:

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

When trying to debug your application in your device, that means the adb server was not initialized right, to solve this problem, do the next steps:

1. Be sure Eclipse is not running
2. Open the command prompt in the Android SDK platform-tools directory
3. Type the command: adb kill-server, to stop the server
4. Restart the server with the command: adb start-server
5. Start Eclipse 

Now you should be able to test you app in your device