Unable to render
win 10 64bit
GPU:titan black
[WARNING] :: ..\..\..\..\..\src\pluginsource\DzIrayRender\dzneuraymgr.cpp(367): Iray [ERROR] - IRAY:RENDER :: 1.0 IRAY rend error: Cannot render: found no usable devices. Please update your NVIDIA driver (www.nvidia.com) to at least 471.41, or enable CPU-only rendering.
2022-06-15 16:16:52.999 [ERROR] Iray :: Invalid parameters (NULL pointer).
I have updated the latest driver

Comments
Did you upgrade Studio recently?
Was it working before?
Support for Keppler cards was removed in DS 4.12.2.31.
http://docs.daz3d.com/doku.php/public/software/dazstudio/4/change_log_4_14_0_10