500 server error

Using Raspberry pi 3 B+ w/32GB SD card. Followed install steps on HA site. After startup I can reach Port 8123 but see this error repeatedly:

My Netgear AC1600 router was providing Comcast DNS so I switched to 1.1.1.1 but no change. Internet connection works fine for 2+ dozen other devices. Is this a local problem or ghcr.io problem? Port 4357 confirms supervisor ‘unhealthy’ and was unable to update.
Thanks in advance

Problem solved?! Saw some of the Netgear Nighthawk DNS issues experienced by others that could some times be fixed by enabling IPV6 on WAN side of router. Changed mine from disabled to auto-detect and voila! and I’ve gotten past ‘Preparing Home Assistant’ to ‘Create my Smart home’! Glad I’m not working in IT anymore…