Could someone explain what happened and how to fix this?

i would send a picture but i don't know how. so i was starting a game champ select finished and as i was entering the game, i was kicked out and a box appeared telling me: "an unkown DirectX error has occurred and league of legends cannot start. Please make sure your video card is using the latest video drivers from the manufacturer". In over a year this has never happened to me and i never touch video setting as i don't know how they work, does someone know what happened and possibly how to fix this? Thanks a lot in advance

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