Everything turns black with Radiance V

Hey, i installed the Radiance V mod which requires Shader quality to be high or above and post FX at ultra, but when I change those two settings to what they are supposed to be it makes everything just black, i can still move and see my map but i don't know how to fix it. When I turn the settings back down it fixes it but then the mod doesn't work as intended (to make my police lights brighter) ive used this mod before but recently had a new drive in. If anyone knows how to fix this please tell me, thanks!