error message saying GPULightmassKernel.dll is not found

Hi im currently having an error message saying GPULightmassKernel.dll is not found. This message pops up when I try to build the lights. Do you know what I have to do? How to i Install it?

Try to find locate the .dll , than u could add it to the path variable of your System. You can google Path environment. ( i have no experience with this .dll but maybe look in Unreal binaries folder :" -4.22.0-UnifiedSettings/Engine/Binaries/Win64/GPULightmassKernel.dll"