Missing AdActivity with android:configChanges in AndroidManifest.xml

I am building an app and I wanted to add ad banners to the game when I run it instead of getting adds I am getting a banner that says"Missing AdActivity with android:configChanges in AndroidManifest.xml" I have tried searching online for the problem but it seems that what the people say to fix the problem I already have corrected. Please help

What I put in my Manifest

 <manifest
 xmlns:android="http://schemas.android.com/apk/res/android"
 package="com.unity3d.player"
 android:installLocation="preferExternal"
 android:theme="@android:style/Theme.NoTitleBar"
 android:versionCode="1"
 android:versionName="1.0">
 <supports-screens
     android:smallScreens="true"
     android:normalScreens="true"
     android:largeScreens="true"
     android:xlargeScreens="true"
     android:anyDensity="true"/>

 <application
     android:icon="@drawable/app_icon"
     android:label="@string/app_name"
     android:debuggable="true">
     <activity android:name="com.unity3d.player.UnityPlayerNativeActivity"
               android:launchMode="singleTask"
               android:label="@string/app_name"
                   android:configChanges="fontScale|keyboard|keyboardHidden|locale|mnc|mcc|navigation|orientation|screen      Layout|screenSize|smallestScreenSize|uiMode|touchscreen">
         <intent-filter>
             <action android:name="android.intent.action.MAIN" />
             <category android:name="android.intent.category.LAUNCHER" />
         </intent-filter>
         <meta-data android:name="unityplayer.ForwardNativeEventsToDalvik" android:value="true" />
     </activity>
     <activity android:name="com.google.android.gms.ads.AdActivity"
        android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|uiMode|screenSize|smallestScr eenSize"
       android:theme="@android:style/Theme.Translucent" />

     <meta-data android:name="com.google.android.gms.version"
        android:value="@integer/google_play_services_version" />
 </application>
   
 </manifest>
  <uses-permission android:name="android.permission.INTERNET"/>
 <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>