My game won't open.

Hello guys so before i get started i'd like to say that I am on a Mac ( It's not old I got it a year ago , League has been working perfect until today ). So I qued up for a game with my friends and got through champ select and once loading screen opened up, it just crashed instantly and gave me that error shown in the gyazo... I tried repairing my league and checking my internet connection but nothing worked. Any advice as to how to fix this is greatly appreciated but as of now I can't play league it just wont work past loading screen at all :(.