Gradle: More than one variant of project :myLib matches the consumer attributes

I have written a custom library gsp-library which uses RemoteMessage from Firebase. My main app also uses Firebase for checking crush issue and so on.

Environment:

gradle 4.7

java 8

Exception:

More than one variant of project :gsp-library matches the consumer attributes How to fix it? Any kind of help will be highly appreciated.

project.gradle

buildscript {

    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.1.2'
        classpath 'com.google.gms:google-services:3.3.0'
    }
}

allprojects {
    repositories {
        ...
    }
}

app.gradle

apply plugin: 'com.android.application'

android {
    compileSdkVersion 27
    defaultConfig {
        applicationId "com.beauty.app"
        minSdkVersion 19
        targetSdkVersion 27
        versionCode 12
        versionName "1.12"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
        multiDexEnabled true
    }
    // Keep the following configuration in order to target Java 8.
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])

    implementation 'com.google.android.gms:play-services-gcm:12.0.1'
    implementation 'com.google.android.gms:play-services:12.0.1'

    implementation 'com.google.firebase:firebase-core:12.0.1'
    implementation 'com.google.firebase:firebase-messaging:12.0.1'
    implementation 'com.google.firebase:firebase-crash:12.0.1'

    implementation project(":gsp-library")
}

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

gsp-library.gradle

apply plugin: 'com.android.library'

android {
    compileSdkVersion 27

    defaultConfig {
        minSdkVersion 19
        targetSdkVersion 27
        versionCode 12
        versionName "1.12"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"

    }
}
dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation group: 'com.google.code.gson', name: 'gson', version: '2.8.2'
    implementation 'com.google.firebase:firebase-messaging:12.0.1'
}

Error comes from both following command:

beautyApp\gsp-library> gradle clean assembleDebug

beautyApp\app> gradle clean assembleDebug

Exception:

More than one variant of project :myModule matches the consumer attributes:
  - Configuration ':myModule:debugApiElements' variant android-aidl:
      - Found artifactType 'android-aidl' but wasn't required.
      - Required com.android.build.api.attributes.BuildTypeAttr 'debug' and found compatible value 'debug'.
      - Found com.android.build.api.attributes.VariantAttr 'debug' but wasn't required.
      - Required com.android.build.gradle.internal.dependency.AndroidTypeAttr 'Aar' and found compatible value 'Aar'.
      - Required org.gradle.usage 'java-api' and found compatible value 'java-api'.
  - Configuration ':myModule:debugApiElements' variant android-classes:
  - Configuration ':myModule:debugApiElements' variant android-manifest:
  - Configuration ':myModule:debugApiElements' variant android-renderscript:
  - Configuration ':myModule:debugApiElements' variant jar:

Root Cause Analysis:

The google-services gradle plugin is made to work with Google Play Services and Firebase 15+, but you're using it with version 12.0.1.

Solution#1:

There is a known bug with Google services 3.3.0.

Either use the 4.0.1 version which fixes the bug or downgrade to 3.2.1

Try to set

classpath 'com.google.gms:google-services:3.2.1'

instead of

classpath 'com.google.gms:google-services:3.3.0'

Resource Link: https://stackoverflow.com/questions/50132601/gradle-more-than-one-variant-of-project-mylib-matches-the-consumer-attributes