I have a strange problem that just started with an existing Android Studio 2.3.3 project.

The build process is not automatically generating an APK, in this case app-debug.apk Log shows build is successful, but no APK anywhere in the project directory tree. Manually selecting Build / Build APK works fine, however.

This is a problem when I change the source and click run. The build process is successful, but then get "Error Installing APK" into the emulator (because the APK does not exist).

This problem only happens on the one project, and I was playing around with Espresso earlier. My guess is I changed a setting somewhere, I just cannot figure out which one. What do I need to change to have the APK generated automatically again? build.gradle included.

```
apply plugin: 'com.android.application'

android {
compileSdkVersion 25
buildToolsVersion "25.0.3"
defaultConfig {
    applicationId "com.example.myapp"
    minSdkVersion 16
    targetSdkVersion 25
    versionCode 2
    versionName "0.0.2"
    vectorDrawables.useSupportLibrary = true
    testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}

signingConfigs {
    release {
        storeFile file("/home/user/keystore/keystore.jks")
        storePassword "xxxxxxxxxxxxxxxxxx"
        keyAlias "xxxxxxxxxxxxxxxxx"
        keyPassword "xxxxxxxxxxxxxxxxxxx"
    }
}

buildTypes {
    release {
        minifyEnabled true
        shrinkResources true
        proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        signingConfig signingConfigs.release
    }
}
lintOptions {
    abortOnError false
}
}

dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
    exclude group: 'com.android.support', module: 'support-annotations'
})
compile 'com.android.support:appcompat-v7:25.3.1'
compile 'com.android.support.constraint:constraint-layout:1.0.2'
compile 'com.google.android.gms:play-services-ads:10.2.4'
compile 'com.google.android.gms:play-services-location:10.2.4'
testCompile 'junit:junit:4.12'
}

```