title: Error receiving Ad when using AdMob SDK
body: <p>I have created a application with webview for displaying for AdMob. I am using the following code.</p>
  
  <pre><code>private AdView adView;  
  @Override
  public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);  
      setContentView(R.layout.activity_main);
      LinearLayout layout = (LinearLayout) findViewById(R.id.linearlayout1);
      adView = new AdView(this, AdSize.BANNER, "/6253334/dfp_example_ad"); 
      View view = addHome(this,"https://www.google.co.in/");
      layout.addView(view,new LinearLayout.LayoutParams(200, 100));
      final AdRequest adRequest = new AdRequest();   
      adRequest.addTestDevice("1CD0A829B8C49C9F7590DD3B4C5EC553");
      adRequest.setTesting(true);
      setContentView(layout);
      new Thread(){
          public void run() {
              Looper.prepare();               
              adView.loadAd(adRequest);                
          };
      }.start();
  } 
  </code></pre>
  
  <p>I am always getting <strong>onFailedToReceiveAd(A network error occurred) error</strong>, instead of getting the ads.</p>