Multiplayer doesn't work.

Since I update de app, my multiplayer stoped working . I was trying to add a friend but at the moment that I press the button  "add fiend” the game  just suddenly close. I already tried to add friends inside the world but happened the same and I don’t know what todo do. 
And also already delete the game and the "x box live” app and installed again but non of the worked. I really hope you can fix this because this doesn’t happened me before the update.  Thank you