Jupyterhub - ERROR:asyncio:Task exception was never retrieved

I'm not able to install Jupyterhub using pip. I tried reinstall, but no matter what, I'm still getting asyncio Error.

Any idea what I'm doing wrong ?

[root@localhost bin]# which python3/usr/bin/python3[root@localhost bin]# which python/usr/bin/python[root@localhost bin]# python3 -VPython 3.6.8[root@localhost bin]# python -VPython 2.7.5

So I'm installing JH using pip, I omitted most of requirements

[root@localhost bin]# pip3 install jupyterhubWARNING: Running pip install with root privileges is generally not a good idea. Try `pip3 install --user` instead.Collecting jupyterhub  Using cached https://files.pythonhosted.org/packages/0d/67/c1e7d691bcb635fcde61c544d8fbca1edebb7bb4f68f34f5de291eba02d0/jupyterhub-1.0.0-py3-none-any.whlRequirement already satisfied: prometheus-client>=0.0.21 in /usr/local/lib/python3.6/site-packages (from jupyterhub)Requirement already satisfied: alembic in /usr/local/lib/python3.6/site-packages (from jupyterhub). . . Requirement already satisfied: cffi!=1.11.3,>=1.8 in /usr/local/lib64/python3.6/site-packages (from cryptography>=2.8->pyopenssl->certipy>=0.1.2->jupyterhub)Requirement already satisfied: pycparser in /usr/local/lib/python3.6/site-packages (from cffi!=1.11.3,>=1.8->cryptography>=2.8->pyopenssl->certipy>=0.1.2->jupyterhub)Installing collected packages: jupyterhubSuccessfully installed jupyterhub-1.0.0

configurable proxy is already installed

[root@localhost bin]# configurable-http-proxy -V4.2.0

but still no progress from Jupyterhub

[root@localhost bin]# jupyterhub -V1.0.0ERROR:asyncio:Task exception was never retrievedfuture: <Task finished coro=<JupyterHub.launch_instance_async() done, defined at /usr/local/lib/python3.6/site-packages/jupyterhub/app.py:2477> exception=SystemExit(0,)>Traceback (most recent call last):  File "/usr/local/lib/python3.6/site-packages/jupyterhub/app.py", line 2492, in launch_instance    loop.start()  File "/usr/local/lib64/python3.6/site-packages/tornado/platform/asyncio.py", line 148, in start    self.asyncio_loop.run_forever()  File "/usr/lib64/python3.6/asyncio/base_events.py", line 438, in run_forever    self._run_once()  File "/usr/lib64/python3.6/asyncio/base_events.py", line 1451, in _run_once    handle._run()  File "/usr/lib64/python3.6/asyncio/events.py", line 145, in _run    self._callback(*self._args)  File "/usr/local/lib/python3.6/site-packages/jupyterhub/app.py", line 2479, in launch_instance_async    await self.initialize(argv)  File "/usr/local/lib/python3.6/site-packages/jupyterhub/app.py", line 2085, in initialize    super().initialize(*args, **kwargs)  File "</usr/local/lib/python3.6/site-packages/decorator.py:decorator-gen-2>", line 2, in initialize  File "/usr/local/lib/python3.6/site-packages/traitlets/config/application.py", line 87, in catch_config_error    return method(app, *args, **kwargs)  File "/usr/local/lib/python3.6/site-packages/traitlets/config/application.py", line 297, in initialize    self.parse_command_line(argv)  File "</usr/local/lib/python3.6/site-packages/decorator.py:decorator-gen-4>", line 2, in parse_command_line  File "/usr/local/lib/python3.6/site-packages/traitlets/config/application.py", line 87, in catch_config_error    return method(app, *args, **kwargs)  File "/usr/local/lib/python3.6/site-packages/traitlets/config/application.py", line 532, in parse_command_line    self.exit(0)  File "/usr/local/lib/python3.6/site-packages/traitlets/config/application.py", line 654, in exit    sys.exit(exit_status)SystemExit: 0[root@localhost bin]#