Thanks but I had already looked at that page and doesn't provide me a solution. I've tried Online Recovery (Restart + Ctrl+ R), then I select "Restore from a Time Machine Backup" , then a list of available Backups appear (I have my main backup on the Time Capsule as well as a copy on an external SSD), but none of the Backups will work. To be clear, I erased the HD for the trade-in, then reloaded OS Sierra when it was returned to me. So I also tried Reinstalling the Mac OS from scratch then trying to restore from the Backup after this clean install. But still comes up as error. The Backup is named for my older 15" MBP ( I just updgraded to a new 16"), so does the error have anything to do with the source file names?
Thanks.