romanaaaaaaa

How can i fix it though? im sorry, im not that good at these things ? I have this problem with every modpack i try to play.. so i dont thinkt that thats te problem

Hi, everytime i try to play my game, any modpack, it starts downloaidng but then stops, the launcher dissapears and comes back, en nothing starts I dont know what to do, and cant find a fix anywhere. Pastebin: https://pastebin.com/PuzC7k6r Thank you!