Mcplayer636

when i load up the launcher, i try playing on any mod. the game loads but my problem is that when i click play selected world,and load my world the game closes and takes me back to the technic launcher. i tried loading up my worlds on different mod packs. but it gives me the same problem when i load up my world, it closes my game and i get sent back to the launcher. i even try re-installing the launcher but it still continues to give me the same problem. does anyone know how to fix please?