Gradle sync failed, implementations

Не понимаю в чём проблема. "Gradle sync failed".

dependencies {
implementation fileTree(include: ['*.jar'], dir: 'libs')
implementation 'com.android.support:appcompat-v7:28.0.0'
implementation 'com.android.support.constraint:constraint-layout:1.1.3'
implementation 'com.android.support:design:28.0.0'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.2'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
implementation 'com.google.android.gms:play-services-ads:17.1.3'
implementation 'com.google.firebase:firebase-ads:17.1.3'
implementation 'com.google.android.ads.consent:consent-library:1.0.6'
}
apply plugin: 'com.google.gms.google-services'

Содержимое другого Gradle.

buildscript {
    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.3.0'
        classpath 'com.google.gms:google-services:3.1.1'
    }
}
allprojects {
    repositories {
        google()
        jcenter()
        maven {
            url "https://maven.google.com"
        }
    }
}
task clean(type: Delete) {
    delete rootProject.buildDir
}