Broken Game

[CarBMW]

when i load up a modpack it goes into the minecraft menu. then i hit singleplayer. when i try to load up a worldthe game just closes. please help cause i have been having this problem for like a week

 

[Kalbintion]

If it is an official modpack then post the issue on the tracker, link at top of the page. If it is for a custom modpack, post in the Platform Pagoda.