Same for me. Trying to figure out what I'm doing wrong...
Viewing post in Stable Diffusion GRisk GUI 0.1 comments
This software have some problems with utilizing half-precision using gtx 16xx GPUs. It should work with full-precision, but the free version of this gui doesn't support it. An alternative for you could be this:
NMKD Stable Diffusion GUI - AI Image Generator
I don't own 16xx GPU, so I can't really confirm, but it should work with 16xx GPUs if you set it up correctly.