Can't upload Android app to device (stale dexed jars)

Question

I am using Android Studio to develop this app, and today when I tried to upload it to my device to test I got a popup window saying:

Installation fail

Answer 1

If you're using Android studio 2.0 preview , disable the instant run .

All credit and thanks go for the life saver https://stackoverflow.com/a/34192979/1413998