I've modified the jupyterhub_config.py file to add a user as an admin but 
its not working.  I am using the Authenticator config below.  

# If unspecified, only the user that launches the server will be admin.
c.Authenticator.admin_users = set(useronsystem)


when i add the user id in the set area, jupyterhub fails to start and i get 
teh  No admin users, admin interface will be unavailable.
then it gives an erro for every character in the user id:

[E 2016-08-30 09:53:28.221 JupyterHub app:864] Error adding user 'o' 
already in db
    Traceback (most recent call last):
      File "/opt/jupyterhub/jupyterhub/app.py", line 859, in init_users
        yield gen.maybe_future(self.authenticator.add_user(user))
      File "/opt/jupyterhub/jupyterhub/auth.py", line 328, in add_user
        raise KeyError("User %s does not exist." % user.name)
    KeyError: 'User o does not exist.'


I'm stumped


Brian

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