Upgrade to AndroidStudio 3.4 and now can´t run my app

Question

I updated my Android Studio to Android Studio 3.4 and I'm trying to run one of my apps but it gives me an error.

com.android.tools.idea.run.ApkProvisionException: No outputs for the main artifact of variant: debug

Session 'app': Install failed. Installation failed Rerun

Answer 1

Solved it by going to Run => Edit Configuration => app (or your project name)

In the Before Launch section, I added Gradle-aware Make.

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The hint came from comparing my project with the example screenshot available at https://developer.android.com/studio/run/rundebugconfig#opening

Answer 2

Try running your app after reloading your gradle project

Right click over your project under Gradle tab

Answer 3

You may be using an incompatible Gradle and Android Gradle plugin version.

Upgrade Gradle to version 4.1 at least

in gradle/wrapper/gradle-wrapper.properties

use:

distributionUrl=https\://services.gradle.org/distributions/gradle-4.1-all.zip

and in root build.gradle

modify the following lines (add Google maven repository and update plugin to 3.0.1):

buildscript {
    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.0.1'
    }
}