Blarney31

Ok, so I've been running Forge for 1.12.2 (with quite a few mods) for a few days now. For some reason, it now all the sudden is refusing to fully launch the game. When I press the "start" button, the green preparing bar at the bottom gets to roughly the halfway point then launcher closes, then re-opens with a popup that says that the game has crashed. Anyone know what's going on/ have any advise on fixing it?