Hi Dodger Guy
I dont beleive that Stubhub is activating barcodes until sometime today. That may explain why you received the error yesterday. Try again today or tomorrow and see if the error disappears.
I also got errors trying to enter my barcodes, but looks like SH has moved the date to enter your barcodes to 2/25. So i would say SH is having issues with it and have even taken away the option to enter the codes now. So hold tight until they get it worked out with MLB. should be a few days as the first spring game is on Sunday.
You can list tickets on Stubhub without barcodes and the listing will stay active until 48 hrs before the event. At that point the listing becomes deactive. If you sell your tickets you should be able to enter the bar codes at that time. If your listing becomes deactivated you will be able to reactivate by adding the bar codes to the listing. I would guess that by Wed or Thursday (23rd or 24th) the barcodes will be activated.