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

I discovered that the dex file was getting larger than the buffer, even though it contained less than 64k methods. Then I enabled ProGuard and it helped a lot reducing the dex file size.

THe application dex-method-counts helps a lot to debug your dex file, by checking not only the number of methods, but to what package they belong