title: Admob ads giving error code 2 (not displaying)
body: <p>I'm trying to make a basic libgdx app and the ads are not being displayed.
  I'm following these guides:
  <a href="https://developers.google.com/android/guides/setup" rel="nofollow noreferrer">https://developers.google.com/android/guides/setup</a></p>
  
  <p><a href="https://developers.google.com/admob/android/eclipse" rel="nofollow noreferrer">https://developers.google.com/admob/android/eclipse</a></p>
  
  <p><a href="https://github.com/libgdx/libgdx/wiki/Admob-in-libgdx" rel="nofollow noreferrer">https://github.com/libgdx/libgdx/wiki/Admob-in-libgdx</a></p>
  
  <p>The code is very basic, just the one copied from the libgdx guide.
  The code works but the ads are not being displayed.</p>
  
  <p><a href="https://i.stack.imgur.com/lKMNH.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/lKMNH.png" alt="Error code 2 libgdx"></a></p>