Gradle build fails due to lint classpath error on Android

I have an Android app whose build fails when I run the following command:
`./gradlew clean build -Pbuild=dev --stacktrace`

Here is the error I receive:
```
> Task :app:lint FAILED

FAILURE: Build failed with an exception.

* What went wrong:
A problem was found with the configuration of task ':app:lint'.
> No value has been specified for property 'lintClassPath'.
```

## App module build.gradle file:
```
apply plugin: 'com.android.application'

apply plugin: 'kotlin-android'

apply plugin: 'kotlin-android-extensions'

apply plugin: 'kotlin-kapt'

apply plugin: 'io.fabric'

apply plugin: "androidx.navigation.safeargs"

// For Epoxy
kapt {
correctErrorTypes = true
}

android {
kotlinOptions {
jvmTarget = '1.6'
}
compileSdkVersion 28
defaultConfig {
applicationId "..."
minSdkVersion 21
targetSdkVersion 28
versionCode 8
versionName "0.4"
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
vectorDrawables.useSupportLibrary = true
}
buildTypes {
debug {
if (project.hasProperty('ApiKey')) {
buildConfigField('String', 'API_KEY', ApiKey)
} else {
buildConfigField('String', 'API_KEY', "\"mock-key\"")
}
}
release {
minifyEnabled true
shrinkResources true
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
if (project.hasProperty('ApiKey')) {
buildConfigField('String', 'API_KEY', ApiKey)
} else {
buildConfigField('String', 'API_KEY', "\"mock-key\"")
}
}

}

def build_param = "${build}"

if (build_param != "dev") {
//exclude production build
android.variantFilter { variant ->
if (variant.buildType.name == 'dev') {
variant.setIgnore(true)
}
}
} else {
//exclude all except production build
android.variantFilter { variant ->
if (variant.buildType.name != 'dev') {
variant.setIgnore(true)
}
}
}

compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
androidExtensions {
experimental = true
}
}

dependencies {
implementation fileTree(include: ['*.jar'], dir: 'libs')
implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"

// Android
def lifecycle_version = "2.0.0"
implementation 'androidx.appcompat:appcompat:1.1.0-alpha02'
implementation 'androidx.constraintlayout:constraintlayout:2.0.0-alpha3'
implementation 'androidx.legacy:legacy-support-v4:1.0.0'
implementation "androidx.lifecycle:lifecycle-extensions:$lifecycle_version"
implementation 'com.google.android.material:material:1.0.0'
implementation "androidx.lifecycle:lifecycle-extensions:$lifecycle_version"
implementation 'androidx.core:core-ktx:1.0.1'
implementation 'androidx.preference:preference:1.0.0'
implementation 'androidx.legacy:legacy-preference-v14:1.0.0'

def room_version = "2.1.0-alpha04"
implementation "androidx.room:room-runtime:$room_version"
implementation "androidx.room:room-rxjava2:$room_version"
kapt "androidx.room:room-compiler:$room_version"

def nav_version = "1.0.0-rc02"
implementation "android.arch.navigation:navigation-fragment-ktx:$nav_version"
implementation "android.arch.navigation:navigation-ui-ktx:$nav_version"

// Networking
implementation 'com.squareup.retrofit2:retrofit:2.5.0'
implementation 'com.squareup.retrofit2:adapter-rxjava2:2.5.0'
implementation 'com.squareup.okhttp3:okhttp:3.13.1'
implementation 'com.squareup.okhttp3:logging-interceptor:3.13.1'
implementation 'com.squareup.retrofit2:converter-moshi:2.4.0'
implementation 'com.squareup.moshi:moshi-adapters:1.8.0'
// DI
def koin_version = "1.0.2"
implementation "org.koin:koin-android:$koin_version"
implementation "org.koin:koin-androidx-scope:$koin_version"
implementation "org.koin:koin-androidx-viewmodel:$koin_version"
// Rx
implementation 'io.reactivex.rxjava2:rxjava:2.2.7'
implementation 'io.reactivex.rxjava2:rxandroid:2.1.1'
implementation 'io.reactivex.rxjava2:rxkotlin:2.3.0'
implementation 'com.jakewharton.rxbinding2:rxbinding:2.2.0'
implementation 'com.jakewharton.rxrelay2:rxrelay:2.1.0'
// Image Loading
implementation 'com.github.bumptech.glide:glide:4.8.0'
kapt 'com.github.bumptech.glide:compiler:4.8.0'
// Tests
testImplementation 'junit:junit:4.12'
testImplementation 'org.mockito:mockito-core:2.24.5'
androidTestImplementation 'androidx.test:runner:1.1.1'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.1'
// UI
implementation 'com.pierfrancescosoffritti.androidyoutubeplayer:core:9.0.1'
implementation 'com.airbnb.android:epoxy:3.2.0'
kapt 'com.airbnb.android:epoxy-processor:3.2.0'
implementation 'com.github.VladimirWrites:Lemniscate:1.4.4'
// Firebase
implementation 'com.google.firebase:firebase-core:16.0.7'
implementation 'com.crashlytics.sdk.android:crashlytics:2.9.9'
}

apply plugin: 'com.google.gms.google-services'

```

## Project level build.gradle file:
```
// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {
ext.kotlin_version = '1.3.21'
repositories {
jcenter()
maven {
url 'https://maven.fabric.io/public'
}
google()
}
dependencies {
classpath 'com.android.tools.build:gradle:3.3.1'
classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
classpath 'com.google.gms:google-services:4.2.0'
classpath "android.arch.navigation:navigation-safe-args-gradle-plugin:1.0.0-rc02"
classpath 'io.fabric.tools:gradle:1.27.0'
}
}

allprojects {
repositories {
jcenter()
maven {
url 'https://maven.google.com/'
}
maven {
url 'https://jitpack.io'
}
google()
}
}

task clean(type: Delete) {
delete rootProject.buildDir
}
```

I am not sure how to fix this. Downgrading the Android Gradle plugin does not solve the issue, and there are no issues related to this anywhere on Github or Stackoverflow.

Does anyone have any idea how to fix this?

I have figured out what the problem is. I use the build parameter 'dev' (`Pbuild=dev`) to make sure that the CI (Travis, in this case) uses the mock version of my `google-services.json` file placed in the `app/src/dev` folder. However, I forgot to configure the 'dev' build variant in the build.gradle files of my modules.

Solution is to add the `dev` build type in all modules, like this:

> build.gradle
```
android {
...

buildTypes {
release {
...
}
debug {
...
}
dev {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
```

Please note that you will have to do this for all the modules in your project.

In my case this error was triggered because ```ANDROID_HOME``` environment variable wasn't set

I had to accept licenses first. Weird error.

On macOS:

yes | sudo ~/Library/Android/sdk/tools/bin/sdkmanager --licenses


For other platforms see

[To see links please register here]

The cause of this issue is that Gradle can't find the Android SDK. There are several ways to fix it:

Define the `ANDROID_HOME` environment variable

ANDROID_HOME=your/path/to/android/sdk; export ANDROID_HOME

or Add `sdk.dir` to the file `local.properties`, for example on my Linux computer

sdk.dir=/home/sdeng/Android/Sdk

If you already defined `ANDROID_HOME` or `sdk.dir`, it still happens. Its probably something is wrong with the specific version of your Android SDK or Gradle daemon. Try to kill all Gradle processes, re-download the specific version of Android SDK.

Or you can check the SDK at directory `$ANDROID_HOME/platforms/android-28`, where 28 is the `compileSdkVersion` defined in `build.gradle`

Even if `ANDROID_HOME` is set, as others suggested to do, make sure that directory is actually available. I am building in a chroot environment, and neglected to edit my chroot.sh script to account for the directory layout of my newer laptop. As a result, `$HOME/Downloads`, which links to a directory on my Windows partition, was a dead link, and the Android SDK was not found.