title: How to solve inviting friend over game center?
body: <p>I am working on a multiplayer game through game center and I am having one problem. When I try to invite one of my friends I get failed status. I have tried with simulator and iphone and with two iphones and always the same problem.</p>
  
  <p>I have searched a solution for my problem and found out that there are many developers with this problem. I am using iOS 6 and app is still in production so it is in sandbox.</p>
  
  <p>I am using same code like is on Ray Wenderlich tutorial - CatRace (there have too people writen about this problem but nobody has post a solution.</p>
  
  <p>Does anybody know how to solve that problem?</p>