JSON error installing nbextension

[JolleJolles]

When I run the 3rd install command (after successfully running the first two commands) jupyter nbextension install --py hide_code I get the following error:

ValueError: No JSON object could be decoded

with the following traceback:

Traceback (most recent call last):
  File "/usr/local/bin/jupyter-nbextension", line 11, in <module>
    sys.exit(main())
  File "/usr/local/lib/python2.7/site-packages/jupyter_core/application.py", line 267, in launch_instance
    return super(JupyterApp, cls).launch_instance(argv=argv, **kwargs)
  File "/usr/local/lib/python2.7/site-packages/traitlets/config/application.py", line 658, in launch_instance
    app.start()
  File "/usr/local/lib/python2.7/site-packages/notebook/nbextensions.py", line 988, in start
    super(NBExtensionApp, self).start()
  File "/usr/local/lib/python2.7/site-packages/jupyter_core/application.py", line 256, in start
    self.subapp.start()
  File "/usr/local/lib/python2.7/site-packages/notebook/nbextensions.py", line 896, in start
    self.toggle_nbextension_python(self.extra_args[0])
  File "/usr/local/lib/python2.7/site-packages/notebook/nbextensions.py", line 872, in toggle_nbextension_python
    logger=self.log)
  File "/usr/local/lib/python2.7/site-packages/notebook/nbextensions.py", line 483, in enable_nbextension_python
    logger=logger)
  File "/usr/local/lib/python2.7/site-packages/notebook/nbextensions.py", line 386, in _set_nbextension_state_python
    for nbext in nbexts]
  File "/usr/local/lib/python2.7/site-packages/notebook/nbextensions.py", line 351, in _set_nbextension_state
    cm.update(section, {"load_extensions": {require: state}})
  File "/usr/local/lib/python2.7/site-packages/traitlets/config/manager.py", line 85, in update
    data = self.get(section_name)
  File "/usr/local/lib/python2.7/site-packages/traitlets/config/manager.py", line 63, in get
    return json.load(f)
  File "/usr/local/Cellar/python/2.7.12/Frameworks/Python.framework/Versions/2.7/lib/python2.7/json/__init__.py", line 291, in load
    **kw)
  File "/usr/local/Cellar/python/2.7.12/Frameworks/Python.framework/Versions/2.7/lib/python2.7/json/__init__.py", line 339, in loads
    return _default_decoder.decode(s)
  File "/usr/local/Cellar/python/2.7.12/Frameworks/Python.framework/Versions/2.7/lib/python2.7/json/decoder.py", line 364, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/usr/local/Cellar/python/2.7.12/Frameworks/Python.framework/Versions/2.7/lib/python2.7/json/decoder.py", line 382, in raw_decode
    raise ValueError("No JSON object could be decoded")

It would be great if you could fix this.

[kirbs-]

Did pip install hide_code cleanly?

[JolleJolles]

Yes I followed steps 1 and 2 without a problem

[kirbs-]

Never seen this error, but it looks like an issue with nbextension.

[kirbs-]

What version of jupyter are you using?