adb server is out of date. killing

I’m creating my first react-native project with this tutorial: http://facebook.github.io/react-native/ When it comes to executing code and running react-native run-android I am getting: And the app on the android device is obviously not working. I’ve reinstalled the SDK, tried to adb kill-server and adb start-server, but nothing seems to work I’m using Android 4.4 and Ubuntu 14.04

Android ADB devices unauthorized

Thankgod xda developers exist : http://forum.xda-developers.com/verizon-lg-g3/help/unable-to-access-adb-t2830087 Just had to delete adbkey file in C:Users/$Name/.android adbkey.pub was missing. Restart after this and both files are there. If this does not work : – Try Revoke USB DEBUGGING Authorization. – Enable USB debugging again.