Project can not be rendered with OptiX currently due to usage of Ambient Occlusion and Bevel nodes (raytrace nodes are not supported in Optix at the moment). You'll need to switch to CUDA or CPU rendering (Preferences - System - Cycles Render Device). If you from the future, this might not be an issue Update: Support for bevel and AO nodes in Optix was added in blender 2.92, now you can render project with Optix.