Jupyter notebook fails to start

Part 1 (2018)
5

I found a resolution for the bug regarding the ValueError. Here is my error:

(fastai) paperspace@ps5yydjaa:~/fastai$ jupyter notebook
Traceback (most recent call last):
  File "/home/paperspace/anaconda3/envs/fastai/lib/python3.6/site-packages/traitlets/traitlets.py", line 528, in get
    value = obj._trait_values[self.name]
KeyError: 'allow_remote_access'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/paperspace/anaconda3/envs/fastai/lib/python3.6/site-packages/notebook/notebookapp.py", line 869, in _default_allow_remote
    addr = ipaddress.ip_address(self.ip)
  File "/home/paperspace/anaconda3/envs/fastai/lib/python3.6/ipaddress.py", line 54, in ip_address
    address)
ValueError: '' does not appear to be an IPv4 or IPv6 address

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/paperspace/anaconda3/envs/fastai/bin/jupyter-notebook", line 11, in <module>
    sys.exit(main())
  File "/home/paperspace/anaconda3/envs/fastai/lib/python3.6/site-packages/jupyter_core/application.py", line 266, in launch_instance
    return super(JupyterApp, cls).launch_instance(argv=argv, **kwargs)
  File "/home/paperspace/anaconda3/envs/fastai/lib/python3.6/site-packages/traitlets/config/application.py", line 657, in launch_instance
    app.initialize(argv)
  File "<decorator-gen-7>", line 2, in initialize
  File "/home/paperspace/anaconda3/envs/fastai/lib/python3.6/site-packages/traitlets/config/application.py", line 87, in catch_config_error
    return method(app, *args, **kwargs)
  File "/home/paperspace/anaconda3/envs/fastai/lib/python3.6/site-packages/notebook/notebookapp.py", line 1629, in initialize
    self.init_webapp()
  File "/home/paperspace/anaconda3/envs/fastai/lib/python3.6/site-packages/notebook/notebookapp.py", line 1379, in init_webapp
    self.jinja_environment_options,
  File "/home/paperspace/anaconda3/envs/fastai/lib/python3.6/site-packages/notebook/notebookapp.py", line 158, in __init__
    default_url, settings_overrides, jinja_env_options)
  File "/home/paperspace/anaconda3/envs/fastai/lib/python3.6/site-packages/notebook/notebookapp.py", line 251, in init_settings
    allow_remote_access=jupyter_app.allow_remote_access,
  File "/home/paperspace/anaconda3/envs/fastai/lib/python3.6/site-packages/traitlets/traitlets.py", line 556, in __get__
    return self.get(obj, cls)
  File "/home/paperspace/anaconda3/envs/fastai/lib/python3.6/site-packages/traitlets/traitlets.py", line 535, in get
    value = self._validate(obj, dynamic_default())
  File "/home/paperspace/anaconda3/envs/fastai/lib/python3.6/site-packages/notebook/notebookapp.py", line 872, in _default_allow_remote
    for info in socket.getaddrinfo(self.ip, self.port, 0, socket.SOCK_STREAM):
  File "/home/paperspace/anaconda3/envs/fastai/lib/python3.6/socket.py", line 745, in getaddrinfo
    for res in _socket.getaddrinfo(host, port, family, type, proto, flags):
socket.gaierror: [Errno -2] Name or service not known

And here is how I fixed it…

Open up ~/.jupyter/jupyter_notebook_config.py and add this line to the very end:

c.NotebookApp.allow_remote_access = True

To do this in one single command you could even do the following:

echo "c.NotebookApp.allow_remote_access = True" >> ~/.jupyter/jupyter_notebook_config.py

Then jupyter notebook will start successfully. At least it did for me!

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