ubuntu@ip-172-31-26-255:~$ jupyterhub --generate-config
Traceback (most recent call last):
  File "/usr/local/bin/jupyterhub", line 7, in <module>
    from jupyterhub.app import main
  File "/usr/local/lib/python3.4/dist-packages/jupyterhub/app.py", line 1501
    async def init_users(self):
            ^
SyntaxError: invalid syntax