title: GameCenter showing "No Challenges Screen"
body: <p>I have thoroughly followed many tutorials on integrating GameCenter into my app. I am using the proper code to post scores and getting report that the scores are being reported to GC. However, when I try to load the leaderboard it shows a "No Challenges" blank screen instead. </p>
  
  <p>I have combed over as many relevant stackoverflow questions as I can, as well as looked at the documentation. Neither has helped solve my problem. </p>
  
  <p>Some extra information to prevent worthless answers from trolls on this post.</p>
  
  <ol>
  <li>I have made 3 sandbox user accounts and posted with them all</li>
  <li>I have ensured my leaderboard id is accurately pasted into the code.</li>
  </ol>
  
  <p>The code for auth 
      //initiate gamecenter
      func authenticateLocalPlayer(){</p>
  
  <pre><code>    let localPlayer: GKLocalPlayer = GKLocalPlayer.localPlayer()
  
      localPlayer.authenticateHandler = {(viewController, error) -&gt; Void in
  
          if (viewController != nil) {
              self.presentViewController(viewController, animated: true, completion: nil)
          }
  
          else {
              println((GKLocalPlayer.localPlayer().authenticated))
          }
      }
  }
  </code></pre>
  
  <p>The code for displaying leaderboard </p>
  
  <p>func showLeaderboard() {</p>
  
  <pre><code>    // declare the Game Center viewController
      var gcViewController: GKGameCenterViewController = GKGameCenterViewController()
      gcViewController.gameCenterDelegate = self
  
      gcViewController.viewState = GKGameCenterViewControllerState.Leaderboards
      // Remember to replace "Best Score" with your Leaderboard ID (which you have created in iTunes Connect)
      gcViewController.leaderboardIdentifier = "1019900515.HighScore"
      // Finally present the Game Center ViewController
     //self.showViewController(gcViewController, sender: self)
    //  self.navigationController?.pushViewController(gcViewController, animated: true)
      self.presentViewController(gcViewController, animated: true, completion: nil)
  }
  </code></pre>