For what device are you getting that error message?
There's a github pr raised against the firmware selector or asu if you want the short name for attended system upgrade.
@efahl maintains owut, who is seeing these issues directly over on Owut: OpenWrt Upgrade Tool - #616 by efahl
If you aren't in a hurry to test the new release, I'd hold off until the weekend. There's a caching issue and a release trigger issue that needs resolving on the podman containers that are the back end to the firmware selector