Android 8.1 Не удалось получить провайдера com.google.android.gms.ads.MobileAds!!! апк сбой

Моя версия Android Studio 3.4.1, я пытаюсь добавить код MobileAds в свой проект, созданный с помощью SDK 28, но получаю отчет о сбое. не знаю почему????

Я проверил все похожие сообщения, но некоторые из них устарели и, к сожалению, не смогли найти решения.

Мой манифест Android

<meta-data
    android:name = "com.google.android.gms.ads.AD_MANAGER_APP"
    android:value = "true"/>

<meta-data
    android:name = "com.google.android.gms.ads.APPLICATION_ID"
    android:value = "ca-app-pub-3940256099942544/6300978111"/>
        <activity
    android:name = "com.google.android.gms.ads.AdActivity" android:configChanges = "keyboard|keyboardHidden|orientation|screenLayout|uiMode|screenSize|smallestScreenSize"
    android:screenOrientation = "portrait" />

Макет основной деятельности

    <com.google.android.gms.ads.AdView
android:id = "@+id/adView"
android:layout_width = "match_parent"
android:layout_height = "wrap_content"
android:layout_alignParentBottom = "true"
android:layout_centerHorizontal = "true"
android:layout_gravity = "bottom"
android:layout_weight = "1"
ads:adSize = "SMART_BANNER"
ads:adUnitId = "ca-app-pub-3940256099942544/6300978111">

Сборка приложения.gradle

   android {
compileSdkVersion 28
buildToolsVersion '28.0.3'
defaultConfig {
minSdkVersion 19
targetSdkVersion 28
multiDexEnabled true
buildTypes {
release {
    minifyEnabled false
    proguardFiles getDefaultProguardFile('proguard-android.txt'), 
'proguard-rules.txt'
}
}
repositories {
jcenter()
mavenCentral()  // GPUImage for Android
}
dexOptions {
javaMaxHeapSize "4g"
}
productFlavors {
}
} 
dependencies {
implementation fileTree(include: ['*.jar'], dir: 'libs')
implementation files('libs/acra-4.5.0.jar')
implementation files('libs/ormlite-android-4.43.jar')
implementation files('libs/ormlite-core-4.43.jar')
// If you want to use the GPU Filters
implementation 'com.android.support:support-v4:28.0.0'
implementation 'com.android.support:appcompat-v7:28.0.0'
implementation 'com.android.support:design:28.0.0'
implementation 'com.android.support:cardview-v7:28.0.0'
 implementation 'com.google.firebase:firebase-ads:17.2.1'
implementation 'com.google.firebase:firebase-messaging:18.0.0'
implementation 'com.loopj.android:android-async-http:1.4.9'
implementation 'com.github.bumptech.glide:glide:4.9.0'
implementation 'jp.wasabeef:glide-transformations:2.0.1'
implementation 'com.onesignal:OneSignal:3.10.9'
implementation 'com.android.support.constraint:constraint-layout:1.1.3'
implementation 'com.android.support:animated-vector-drawable:28.0.0'
implementation 'com.android.support:customtabs:28.0.0'
implementation 'com.android.support:exifinterface:28.0.0'
implementation 'com.google.android.gms:play-services-ads:17.2.1'
implementation 'com.google.android.gms:play-services-maps:+'

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

HomeActivity.java

    @Override
 protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home_new);
MobileAds.initialize(this, "ca-app-pub-3940256099942544/6300978111");

AdView mAdView = (AdView) findViewById(R.id.adView);
try{

    AdRequest adRequest = new AdRequest.Builder().build();
    mAdView.loadAd(adRequest);

    if (admov_status.equalsIgnoreCase("true")){
        mAdView.setVisibility(View.VISIBLE);
    }else if (admov_status.equalsIgnoreCase("false")) {
        mAdView.setVisibility(View.GONE);
    }
}catch (RuntimeException e){
    mAdView.setVisibility(View.GONE);
}
}

Но все равно вылетает ОШИБКА. Подробная информация об ошибке logcat здесь

java.lang.RuntimeException: Unable to get provider com.google.android.gms.ads.MobileAdsInitProvider: java.lang.IllegalStateException: 

******************************************************************************
* Invalid application ID. Follow instructions here: Link to *
* find your app ID.                                                          *
******************************************************************************


    at android.app.ActivityThread.installProvider(ActivityThread.java:6242)
    at android.app.ActivityThread.installContentProviders(ActivityThread.java:5805)
    at android.app.ActivityThread.handleBindApplication(ActivityThread.java:5722)
    at android.app.ActivityThread.-wrap1(Unknown Source:0)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1656)
    at android.os.Handler.dispatchMessage(Handler.java:106)
    at android.os.Looper.loop(Looper.java:164)
    at android.app.ActivityThread.main(ActivityThread.java:6494)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
 Caused by: java.lang.IllegalStateException: 

******************************************************************************
* Invalid application ID. Follow instructions here: Link to *
* find your app ID.                                                          *
******************************************************************************


    at com.google.android.gms.internal.ads.zzabh.attachInfo(Unknown Source:19)
    at com.google.android.gms.ads.MobileAdsInitProvider.attachInfo(Unknown Source:3)
    at android.app.ActivityThread.installProvider(ActivityThread.java:6239)
        ... 10 more

Может ли кто-нибудь помочь мне разобраться в проблеме, пожалуйста.