Plugin with id 'com.google.gms.google-services' not found

Question

Had the same problem.

Fixed by adding the dependency

classpath 'com.google.gms:google-services:3.0.0'

to the root build.gradle.

https://firebase.google.com/docs/android/setup#manually_add_firebase

Add classpath com.google.gms:google-services:3.0.0 dependencies at project level build.gradle

Refer the sample block from project level build.gradle

buildscript {
    repositories {
        jcenter()
    }
    dependencies {

        classpath 'com.android.tools.build:gradle:2.3.3'
        classpath 'com.google.gms:google-services:3.0.0'

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

You can find the correct dependencies here apply changes to app.gradle and project.gradle and tell me about this, greetings!

---

Your apply plugin: 'com.google.gms.google-services' in app.gradle looks like this:

apply plugin: 'com.android.application'

android {
    compileSdkVersion 24
    buildToolsVersion "24.0.2"

    defaultConfig {
        applicationId "com.example.personal.numbermania"
        minSdkVersion 10
        targetSdkVersion 24
        versionCode 1
        versionName "1.0"

        multiDexEnabled true
    }

    dexOptions {
        incremental true
        javaMaxHeapSize "4g" //Here stablished how many cores you want to use your android studi 4g = 4 cores
    }

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

dependencies {
        compile fileTree(include: ['*.jar'], dir: 'libs')
        testCompile 'junit:junit:4.12'
        compile 'com.android.support:appcompat-v7:24.2.1'
        compile 'com.android.support:design:24.2.1'
        compile 'com.google.firebase:firebase-ads:9.6.1'
        compile 'com.google.firebase:firebase-core:9.6.1'
        compile 'com.google.android.gms:play-services:9.6.1'
}

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

---

Add classpath to the project's gradle:

classpath 'com.google.gms:google-services:3.0.0'

---

Google play services library on SDK Manager:

Had the same problem.

adding this to my dependency didn't solve

classpath 'com.google.gms:google-services:3.0.0'

Adding this solved for me

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

to the root build.gradle.

simply add "classpath 'com.google.gms:google-services:3.0.0'" to android/build.gradle to look like this

buildscript {
    repositories {
        maven {
            url "https://maven.google.com"
        }
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.0.1'
        classpath 'com.google.gms:google-services:3.0.0'

       // NOTE: Do not place your application dependencies here; they belong
       // in the individual module build.gradle files

    }
}

and also add "apply plugin: 'com.google.gms.google-services'" to the end of file in android/app/build.gradle to look like this

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

Go To Setting > Android SDK > SDK Tools > Google Play Services

On upgrading to Android Studio 4.2.1, I was prompted to set dependency:

classpath 'com.google.gms:google-services:4.3.7'

However, this caused "Plugin with id 'com.google.gms.google-services' not found".
Leaving it as follows fixed the problem:

classpath 'com.google.gms:google-services:4.3.5'

EDIT:

This problem has now been fixed in:

classpath 'com.google.gms:google-services:4.3.8'