LoL Client Broken

Cant load into a League game due to a 'Unknown DirectX error has occurred and League of Legends cannot start. please make sure your video card is using the lastest video drivers from the manufacturer' before people come and say you need to do this and that to fix it my drivers are all updated i have directX 11 and my computer has been running the game perfectly since i started playing literally last night game was running with not a fault got up this morning got on and boom that error pops up for no reason would really like some help on how to fix it thanks
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