Grey screen

Please help me, whenever i enter the game and select the champion it goes okay, but when the game starts the screen turns grey and i cant do anything please help

file:///Users/mahir/Desktop/Screen%20Shot%202019-09-21%20at%201.37.21%20PM.png

thats the link, copy it and paste it into the searchbar if you want to see, thanks!

(Im on mac btw.)