I can't play games on iPhone 4?

So I've been having a real stupid *** problem lately, whenever i click a game on my home screen, It opens it up, but right before it loads, this screen pops up. And yes, i've tried signing and pressing cancel. Nothing. Help?

I can t play games on iPhone 4

You have to close the game, then go to gamecenter app. After that log in on the app and then after logging in try to open your game again. Now it should work. Hope this helps.