Unable to merge android manifests. Trying to merge incompatible element with unity 2017

Hello,

I am unable to build my android project. I understood that there are 2 manifest files with different data. I just don't know how to make them the same.

Below is the error I get:

 CommandInvokationFailure: Unable to merge android manifests. 
 /Library/Java/JavaVirtualMachines/jdk1.8.0_45.jdk/Contents/Home/bin/java -Xmx2048M -Dcom.android.sdkmanager.toolsdir="/Users/mohamad/Development/android-sdk-macosx/tools" -Dfile.encoding=UTF8 -jar "/Applications/Unity/PlaybackEngines/AndroidPlayer/Tools/sdktools.jar" -
 
 stderr[
 Error: [Temp/StagingArea/AndroidManifest-main.xml, /Users/mohamad/Desktop/Game Projects/ARAB FASHIONISTA/Arab_FashionistaAndroidB/Arab_Fashionista2/Temp/StagingArea/android-libraries/com.google.android.gms.play-services-ads-lite-11.8.0/AndroidManifest.xml:12] Trying to merge incompatible /manifest/application/activity[@name=com.google.android.gms.ads.AdActivity] element:
   <activity
 --    @android:name="com.google.android.gms.ads.AdActivity"
 --    @android:theme="@android:style/Theme.Translucent">
 --</activity>
   <activity
 ++    @android:exported="false"
 ++    @android:name="com.google.android.gms.ads.AdActivity"
 ++    @android:theme="@android:style/Theme.Translucent">
 ]
 stdout[
 [Temp/StagingArea/AndroidManifest-main.xml, /Users/mohamad/Desktop/Game Projects/ARAB FASHIONISTA/Arab_FashionistaAndroidB/Arab_Fashionista2/Temp/StagingArea/android-libraries/GoogleMobileAdsPlugin/AndroidManifest.xml:10] Skipping identical /manifest/application/meta-data[@name=com.google.android.gms.version] element.
 

How to solve this? i have been searching for an entire day :(