Facebook Android sdk Game Request Dialog shows "Game Requests are only available to games"

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.