Ask for work in a completed campaign such as http://labels.wmflabs.org/ui/rowiki/ . The following error message is displayed:
409: No tasks available for user_id=... in campaign_id=... Please try again or check campaign status /stats/rowiki/
The code 409 does not have any meaning for the user and the path should be clearly spelled out as http://labels.wmflabs.org/stats/rowiki/