title: Facebook Android sdk Game Request Dialog shows "Game Requests are only available to games"
body: <p>I'm updating my android app to the latest Facebook SDK (4.0.0). When I create a GameRequestDialog, it shows me this message:  "Game Requests are only available to games", instead of showing my facebook friends. I was using WebDialog before in the older sdk and this didn't happen. I tried using WebDialog in sdk 4 but it still shows me this message. </p>
  
  <p>UPDATE: here's the logcat output</p>
  
  <pre><code>{FacebookServiceException: httpResponseCode: -1, facebookErrorCode: 3405, facebookErrorType: null, message: Game Requests are only available to games.}
  </code></pre>