While adding AdView in xml error is coming as Class referenced in the layout file, com.google.android.gms.ads.AdView, was not found in the project

Question

While adding AdView in xml error is coming as. Class referenced in the layout file, com.google.android.gms.ads.AdView, was not found in the project or the libraries Cannot resolve class com.google.android.gms.ads.AdView

Can anyone help me on this error. I'm using latest version of Android Studio.

Project - Build.Gradle

    dependencies {
        classpath 'com.google.gms:google-services:4.3.10'
    }
plugins {
    id 'com.android.application' version '7.1.2' apply false
    id 'com.android.library' version '7.1.2' apply false
    id 'org.jetbrains.kotlin.android' version '1.6.10' apply false
}

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

Module - Build.Gradle

    id 'com.android.application'
    id 'org.jetbrains.kotlin.android'
    id 'com.google.gms.google-services'
}

android {
    
    compileSdkVersion 31
    buildToolsVersion "30.0.3"

    defaultConfig {
        applicationId "in.xx.xxx"
        minSdkVersion 23
        targetSdkVersion 31
        versionCode 4
        versionName "1.0.4"

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
        signingConfig signingConfigs.release
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
    kotlinOptions {
        jvmTarget = '1.8'
    }
    buildFeatures {
        viewBinding true
    }
}

dependencies {
    implementation 'androidx.core:core-ktx:1.7.0'
    implementation 'androidx.appcompat:appcompat:1.4.1'
    implementation 'com.google.android.material:material:1.5.0'
    implementation 'com.google.firebase:firebase-firestore-ktx:24.0.2'
    implementation 'com.google.android.gms:play-services-ads:20.6.0'
    testImplementation 'junit:junit:4.13.2'
    androidTestImplementation 'androidx.test.ext:junit:1.1.3'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
} 

Setting.Gradle

    repositories {
        gradlePluginPortal()
        google()
        mavenCentral()
    }
}
dependencyResolutionManagement {
    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
    repositories {
        google()
        mavenCentral()
        maven { url 'https://jitpack.io' }
    }
}

include ':app'
rootProject.name = "xx"

Answer 1

By tugging the Gradle my issue resolved after 8 days.