Since the new launcher, mods that need cores like "ChickenCore" doesn't work. For whatever reason, everytime people try to run the game with it, they get the error "An unexpected issue occurred and the game has crashed. We're sorry for the inconvenience."
It happens everytime people try to load the game with the new launcher. Funny part is, if you run the same game with an older launcher, it goes normally. No problem at all!