Unable to merge android manifests

Hi, I was working with google play services without any problem. after I add Admob, I start seeing this issue. I don't know what's the problem. I tried to search about it here, but I couldn't find any working solution. Can you help please?

 Error building Player: CommandInvokationFailure: Unable to merge android manifests. See the Console for more details. 
 C:/Program Files/Java/jdk1.8.0_91\bin\java.exe -Xmx2048M -Dcom.android.sdkmanager.toolsdir="C:/Users/Wasim-PC/AppData/Local/Android/sdk\tools" -Dfile.encoding=UTF8 -jar "C:\Program Files\Unity\Editor\Data\PlaybackEngines\AndroidPlayer/Tools\sdktools.jar" -
 
 stderr[
 Error: [Temp\StagingArea\AndroidManifest-main.xml:22, C:\Users\Wasim-PC\Documents\Fly With The Air\Temp\StagingArea\android-libraries\MainLibProj\AndroidManifest.xml:13] Trying to merge incompatible /manifest/application/meta-data[@name=com.google.android.gms.version] element:
   <meta-data
       @android:name="com.google.android.gms.version"
 --    @android:value="8115000">
   <meta-data
       @android:name="com.google.android.gms.version"
 ++    @android:value="@integer/google_play_services_version">
 Error: [Temp\StagingArea\AndroidManifest-main.xml:22, C:\Users\Wasim-PC\Documents\Fly With The Air\Temp\StagingArea\android-libraries\play-services-basement-9.2.1\AndroidManifest.xml:5] Trying to merge incompatible /manifest/application/meta-data[@name=com.google.android.gms.version] element:
   <meta-data
       @android:name="com.google.android.gms.version"
 --    @android:value="8115000">
   <meta-data
       @android:name="com.google.android.gms.version"
 ++    @android:value="@integer/google_play_services_version">
 ]
 stdout[
 
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