Hello I have this error just for selecting Corona as a renderer. I dont have denoiser enabled.
Lookup:
Program Files\Corona\optix\optix51.dll → RMB → “Properties” → “Details” → “File version”
Should read “5.1.2.0”. If not (seems so), something went wrong during installation of Corona. But you still could copy the appropriate files into that directory or try to reinstall Corona.
Good Luck
I removed everything Corona related including any folder and reinstalled everything and all is working normal again. No error. As Frood pointed out is possilbe something went wrong during the install. I had the Beta 2 version installed.

