title: Admob Ad doesn't show
body: <p>In my android app, TEST Ad shows successfully but real Ad doesn't show .
  I am getting this error in logcat:-</p>
  
  <pre><code> 11-02 13:14:21.129: W/Ads(6341): There was a problem getting an ad response. ErrorCode: 0
   11-02 13:14:21.133: W/Ads(6341): Failed to load ad: 0
  </code></pre>
  
  <p>Can anybody tell me why this is happening ???</p>
  
  <p>My code to show Ad:</p>
  
  <p>from MainActivity i called </p>
  
  <pre><code>     AdUtils.showAd(context);
  </code></pre>
  
  <p>then my showAd is like this:</p>
  
  <pre><code>public static void showAd(Context context) {
      try {
          isGooglePlayServiceAvailable = Utils.isGooglePlayServiceAvailable(context);
          if (isGooglePlayServiceAvailable) {
                  showInterstitalAd(context);
              } 
           else {
  
          }
      } catch (ClassCastException e) {
          e.printStackTrace();
          return;
      }
  
  }
  
  public static void showInterstitalAd(Context context) {
      try {
          final InterstitialAd interstitial = new InterstitialAd(context);
          interstitial.setAdUnitId(Constants.INTERSTITIAL_AD_ID);
          AdRequest adRequest = new AdRequest.Builder()
          .build();
          interstitial.loadAd(adRequest);
          interstitial.setAdListener(new AdListener() {
              public void onAdLoaded() {
                  super.onAdLoaded();
                  if (interstitial.isLoaded()) {
                      interstitial.show();
                  }
              };
          });
      } catch (Exception e) {
          Log.i("TEST", "Ad Mob execpt");
          e.printStackTrace();
      }
  }
  </code></pre>