title: Peerfinder.Start() gives System.UnauthorizedAccessException
body: <p>I just started playing with bluetooth communication on WP8.
  I found a example here: <a href="http://msdn.microsoft.com/en-us/library/windowsphone/develop/jj207007(v=vs.105).aspx" rel="nofollow noreferrer">http://msdn.microsoft.com/en-us/library/windowsphone/develop/jj207007(v=vs.105).aspx</a></p>
  
  <p>But as soon as Peerfinder.Start() is hit, i get this error:
  A first chance exception of type 'System.UnauthorizedAccessException' occurred in PhoneApp3.DLL</p>
  
  <pre><code>public MainPage()
  {
      InitializeComponent();
      PeerFinder.Start();
  }
  
  async private void AppToApp_Click(object sender, RoutedEventArgs e)
  {
      // PeerFinder.Start() is used to advertise our presence so that peers can find us. 
      // It must always be called before FindAllPeersAsync.
      var peers = await PeerFinder.FindAllPeersAsync();
  
      if (peers.Count == 0)
      {
          Debug.WriteLine("Peer not found.");
      }
      else
      {
          Debug.WriteLine(peers.Count + " peers found");
      }
  }
  </code></pre>