and @avalx
Haven’t encountered this so I turned on F-Droid Archive and it gave the same error:
I think it should be something to do with the archive repo, not your problem. Try switching off syncing the “F-Droid Archive” repository it should help. In settings press repositories>switch off F-droid Archive
Btw I don’t think you need the archive anyway, the apps in the default one is the most updated and well designed.