Game crashed loading into Ranked game

As the title says, my game crashed while loading into a ranked game. It says, "An unknown DirectX error has occured and Leauge of Legends cannot start. Please make sure your video card is using the latest video drivers from the manufacturer." I checked for any updates and found none. I am running Windows 10 with an AMD Radeon R7 200 Series graphics card with software version 15.12. Also tried restarting and launching League as an Administrator.

RIP Ranked, RIP placement game 6.