Android Question FirebaseAdMob error

hi all i tryed to run the example in https://www.b4x.com/android/forum/t...b-ads-integrated-with-firebase-backend.67710/
and i receive the following can you explain what i did wrong?


Logger connected to: samsung GT-I9060
--------- beginning of /dev/log/main
** Service (starter) Create **
** Service (starter) Start **
** Activity (main) Create, isFirst = true **
Error occurred on line: 34 (Main)
java.lang.IllegalStateException: A required meta-data tag in your app's AndroidManifest.xml does not exist. You must have the following declaration within the <application> element: <meta-data android:name="com.google.android.gms.version" android:value="@Integer/google_play_services_version" />
at com.google.android.gms.common.zzg.zzaH(Unknown Source)
at com.google.android.gms.common.zzg.isGooglePlayServicesAvailable(Unknown Source)
at com.google.android.gms.common.zze.isGooglePlayServicesAvailable(Unknown Source)
at com.google.android.gms.internal.zzqe.zzaf(Unknown Source)
at com.google.android.gms.internal.zzek.zza(Unknown Source)
at com.google.android.gms.internal.zzek.zza(Unknown Source)
at com.google.android.gms.internal.zzff.zzfj(Unknown Source)
at com.google.android.gms.internal.zzff.zzfi(Unknown Source)
at com.google.android.gms.internal.zzff.zza(Unknown Source)
at com.google.android.gms.ads.BaseAdView.loadAd(Unknown Source)
at com.google.android.gms.ads.AdView.loadAd(Unknown Source)
at anywheresoftware.b4a.admobwrapper.AdViewWrapper.LoadAd(AdViewWrapper.java:119)
at b4a.example.main._activity_create(main.java:414)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:710)
at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:339)
at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:249)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:134)
at b4a.example.main.afterFirstLayout(main.java:102)
at b4a.example.main.access$000(main.java:17)
at b4a.example.main$WaitForLayout.run(main.java:80)
at android.os.Handler.handleCallback(Handler.java:725)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:176)
at android.app.ActivityThread.main(ActivityThread.java:5319)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869)
at dalvik.system.NativeStart.main(Native Method)
** Activity (main) Resume **