Maverick2383

Yes that exactly is what is happening to me

Ok one day I tried to play attack of the b team and i try to load it but when i try it like it acts like its going to load up but then it just stops and brings me back to the screen where i choose the mod i wanna play. I don't know how to fix it I am on a mac but i have never had this problem i have reset the mod pack my computer i have even uninstalled Technic. Please can someone help me.