Die Google Mobile Ads SDK wurde falsch initialisiert. Admob Publishers

// Add this google library to build.gradle 
dependencies {
	implementation 'com.google.android.gms:play-services-ads:20.5.0'
}

// Then add This to manifest 
<application >

        <meta-data
            android:name="com.google.android.gms.ads.APPLICATION_ID"
            android:value="ca-app-pub-3940256099942544~3347511713"/>
            
</application>
</ProgAli>