Android Studio: "App not installed" error while generating signed apk for updating existing app

Question

I have generated a signed apk for updating the existing app in google store. For testing successful installation, I tried installing the generated apk in my mobile. But it shows "App not installed". I generated the signed apk with the same jks file and key that I used for previous version and followed the steps given in https://abhiandroid.com/androidstudio/generate-signed-apk-android-studio.html. What I am missing here?

I have added the gradle.build screen shot.

Answer 1

App is not signed correctly. You have to be sure that you have checked Signature versions correctly as in previous version.. See this screen shot