title: Admob ads not showing swift
body: <p>Hi i am trying to add admob ads into an application that is already uploaded to the appstore using swift. I made an app in the admob and copied appid, and ads ids and showed respective banner and interstitial ads. The problem here is that when i write this line </p>
  
  <pre><code>request.testDevices = [ "53441f52e531b870fe8c34151a2f6013" ]
  </code></pre>
  
  <p>the test ads show and work perfectly but when i comment this line the following error is shown in the console.</p>
  
  <blockquote>
    <p>Request Error: No ad to show.</p>
  </blockquote>
  
  <p>This message is printed in the overloaded method of <strong>GADBannerViewDelegate</strong></p>
  
  <pre><code> public func interstitial(_ ad: GADInterstitial, didFailToReceiveAdWithError error: GADRequestError){
      print("Inter error: \(error.localizedDescription)")
  }
  </code></pre>
  
  <p>Please help me through this problem. I am really not sure why is it happening?</p>