The connection to adb is down, and a severe error has occurred [duplicate]
Solution 1:
I just got the same problem and to fix it, I opened the task manager and killed the adb.exe process, then I restarted Eclipse.
Solution 2:
Reinstall everything??? no way! just add the path to SDK tools and platform tools in your classpath from Environment Variables. Then restart Eclipse.
other way go to Devices -> Reset adb, or simply open the task manager and kill the adb.exe process.