On some occasions errors within Knald or Lys are due to cached shaders that the driver hasn't compiled correctly or are corrupted in some way. Whenever you install a new driver we always recommend that you perform a clean installation and delete any cached shaders if they are present on your system.
%username%\AppData\Local\Temp\NVIDIA Corporation\NV_Cache
and delete the contents of the folder (You can paste that address directly into a Windows address bar).