I've problem for connect

I'm on twitch with my account I install the mod pack FTB Beyond but when I click on play my launcher opens after i click on play closes but my minecraft does not launch while but before I arrive to play yet so I have unintaller twitch minecraft and everything re install but it still does not work and as soon as I try to restart the game there is a message below while I am no games to throw and I waited a lot of time to see if he will get started but no can you help me please