adb server version doesn't match this client

Question

Whenever I try to run adb devices:

            $ adb devices
            * daemon not running. starting it now *
            * daemon started su         


        

Answer 1

I went through all the answers on SO and it didn't work for me. When I killed the adb.exe process from Task Manager, it kept reopening it and the reason was that Droid Explorer was working in the background.

Killing the DE process via Task Manager and then killing adb.exe (and running it again from the console through 'adb start-server' worked for me.

This can be useful for many people who have rooted their devices.