Got error after adding denoiser

[baoxiaohe_developer]

app sdk version appsdk-win_qt5-nightly-vray_v5.20.24-20230208
Add

RenderChannelDenoiser VRay_denoiser@RE_2 {
enableDeepOutput=1;
enabled=1;
name="VRay denoiser";
engine=0;
mode=2;
type=0;
preset=1;
strength=1;
radius=10;
use_gpu=1;
progressive_update=10;
}

got error

error -5 in file C:\CI\cgrepo\utils\denoiser\src\ocl.cpp, line 335
error -34 in file C:\CI\cgrepo\utils\denoiser\src\ocl.cpp, line 342 error
-34 in file C:\CI\cgrepo\utils\denoiser\src\ocl.cpp, line 206

[stanislav.kirilov]

We can only speculate what the cause of those errors might be. It might be caused by a Windows or driver update(s) that broke OpenCL. Or it might be caused by mixing V-Ray files from different versions. Our GPU developers told me they recently fixed something that might be related but the fix is available in recent version 6 nightlly builds only. If you can switch to version 6 and try the nightlies, that may be useful to resolve the issue or find the real cause.

[baoxiaohe_developer]

no app sdk for version 6.

RenderChannelDenoiser use_gpu=1;
Is gpu denoiser faster than cpu?
gpu denoiser is recommended?

It seems

renderer.GetImage();

don't get the denoise image.