Do you have eclipse opened? If so attach your phone to it and open logcat. Start the game and you will see what might be causing it. Make sure your google game service ID is correct.
@jcalle thank you , and i know all that my problem it's about when i add game service ID i have that error
@cheqrouniyassinediez3 Hi for game services to work at Google 1-You need to first upload your apk to Google in Beta in order to select the package in Game Services. 2-Create Leaderboard and also 5 achievements. 3-Make all the necessary editing in Game Services including linking your game and hit publish at the end. When you hit publish you don't need to reupload the apk to the dahsboard but still need to make a new build (export from buildbox and create and apk) since you will enter the ids inside Game Services in Buildbox. Maybe you are entering wrong ID number please check the ID that I wrote in my Buildbox Google Settings in attachment. Ofcourse here please enter your own ID numbers not mine. I just tested tonight and it worked. It signs automatically and yes it is better you add a Gameservice button either on Game Over Scene or Main Scene to see your scores. Also Make Sure you create an Event With Best Score so Buildbox publishes it to the Leaderboard.