{"action":"closed","issue":{"url":"https://api.github.com/repos/jupyterhub/jupyterhub/issues/605","repository_url":"https://api.github.com/repos/jupyterhub/jupyterhub","labels_url":"https://api.github.com/repos/jupyterhub/jupyterhub/issues/605/labels{/name}","comments_url":"https://api.github.com/repos/jupyterhub/jupyterhub/issues/605/comments","events_url":"https://api.github.com/repos/jupyterhub/jupyterhub/issues/605/events","html_url":"https://github.com/jupyterhub/jupyterhub/issues/605","id":159652871,"number":605,"title":"Traceback after changing hub prefix","user":{"login":"akaihola","id":13725,"avatar_url":"https://avatars.githubusercontent.com/u/13725?v=3","gravatar_id":"","url":"https://api.github.com/users/akaihola","html_url":"https://github.com/akaihola","followers_url":"https://api.github.com/users/akaihola/followers","following_url":"https://api.github.com/users/akaihola/following{/other_user}","gists_url":"https://api.github.com/users/akaihola/gists{/gist_id}","starred_url":"https://api.github.com/users/akaihola/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/akaihola/subscriptions","organizations_url":"https://api.github.com/users/akaihola/orgs","repos_url":"https://api.github.com/users/akaihola/repos","events_url":"https://api.github.com/users/akaihola/events{/privacy}","received_events_url":"https://api.github.com/users/akaihola/received_events","type":"User","site_admin":false},"labels":[],"state":"closed","locked":false,"assignee":null,"milestone":null,"comments":1,"created_at":"2016-06-10T14:52:05Z","updated_at":"2016-06-10T14:54:05Z","closed_at":"2016-06-10T14:54:05Z","body":"I changed the hub prefix in my configuration for JupyterHub 0.6.1 from `'/'` to\r\n\r\n    c.JupyterHub.hub_prefix = '/base/hub/'\r\n\r\nand started JupyterHub. I got this:\r\n```\r\n[E 2016-06-10 17:49:05.869 JupyterHub app:1296]\r\n    Traceback (most recent call last):\r\n      File \"jupyterhub/jupyterhub/app.py\", line 1293, in launch_instance_async\r\n        yield self.initialize(argv)\r\n      File \"/usr/lib64/python3.5/types.py\", line 199, in __next__\r\n        return next(self.__wrapped)\r\n      File \"jupyterhub/jupyterhub/app.py\", line 1085, in initialize\r\n        self.load_config_file(self.config_file)\r\n      File \"<decorator-gen-5>\", line 2, in load_config_file\r\n      File \"traitlets/config/application.py\", line 74, in catch_config_error\r\n        return method(app, *args, **kwargs)\r\n      File \"traitlets/config/application.py\", line 565, in load_config_file\r\n        self.update_config(config)\r\n      File \"traitlets/config/configurable.py\", line 192, in update_config\r\n        self._load_config(config)\r\n      File \"traitlets/config/configurable.py\", line 169, in _load_config\r\n        warn(msg)\r\n      File \"/usr/lib64/python3.5/contextlib.py\", line 66, in __exit__\r\n        next(self.gen)\r\n      File \"traitlets/traitlets.py\", line 1085, in hold_trait_notifications\r\n        self.notify_change(change)\r\n      File \"traitlets/traitlets.py\", line 1127, in notify_change\r\n        c(change)\r\n    TypeError: _hub_prefix_changed() missing 2 required positional arguments: 'old' and 'new'\r\n```"}}
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