I just updated my launcher and when it loads, i press play and the launcher reappears saying it has crashed

today there has been a launcher update and i decided to play minecraft. so the launcher updated etc etc, it loaded up and then as soon as i pressed play, it loaded saying that the game has crashed. I did not have this problem before the lancher was updated and have been trying to find a solution for the past 5 minutes or so but havent yet found one.