Admob Banner Ad works, but SmartBanner always returns No Fill Error in WP8 emulator/Device.

[sukumar babu]

Hi guys,
Integrating AdMob Ad for Windows platform.
Created a AdMob AdUnit, added my adUnit to "GoogleAds.ExampleApps.BannerExampleCode" 

           AdView bannerAd = new AdView

            {

                Format = AdFormats.Banner,

                // AdUnitID = "MY_AD_UNIT_ID"    // Added my id here

            };

            bannerAd.VerticalAlignment = VerticalAlignment.Bottom;

            bannerAd.ReceivedAd += OnAdReceived;

            bannerAd.FailedToReceiveAd += OnFailedToReceiveAd;

            LayoutRoot.Children.Add(bannerAd);

            AdRequest adRequest = new AdRequest();

            adRequest.ForceTesting = true;

            bannerAd.LoadAd(adRequest);

Test 1 : (In Emulator)

Ad format : Banner
adRequest.ForceTesting = true;
Result : Works TestAD.

Test 2 : (In Device)

Ad format : Banner
adRequest.ForceTesting = false;
Result : Works.

Test 3: (In Emulator)

Ad format : SmartBanner
adRequest.ForceTesting = true;
Result : Works TestAD.

Test 4: (In Device)

Ad format : SmartBanner
adRequest.ForceTesting = false;
Result : Always No Fill Error.

Tested in Lumia1520, Lumia 520.
Please provide me any suggestions.