I’ve got this error; it is quite weird since I haven’t experienced it ever. Thanks in advance for kindly replying.
This means the NVIDIA S3 mount is not accessible. This could be a network, ISP, or region issue.
If you think you should be able to access this without issue, you can uninstall, and reinstall Nucleus Workstation.
You can also get this content and install directly on Nucleus if you like. Here’s the link on how to do that.
3D Content Pack Installation — Omniverse Launcher latest documentation (nvidia.com)