Error message in Launchpad after running bzr upgrade

[Tom Tobin]

I just ran "bzr upgrade --1.6-rich-root lp:python-wayback", and I'm
now seeing the following error on Launchpad:

File exists: u'/srv/bazaar.launchpad.net/mirrors/00/00/30/02/.bzr':
[Errno 17] File exists:
'/srv/bazaar.launchpad.net/mirrors/00/00/30/02/.bzr'

The error doesn't go away when I refresh the page for this branch:

https://code.launchpad.net/~korpios/python-wayback/trunk

Did I do something screwy?

bzr also claims it made a backup at
"bzr+ssh://korpios@bazaar.launchpad.net/%7Ekorpios/python-wayback/trunk/backup.bzr"
— can I remove that?  Or even access that?