[Python-modules-team] Bug#875538: jupyter-nbextension-jupyter-js-widgets: fails to configure: json.decoder.JSONDecodeError

[Ximin Luo]

Control: tags -1 + moreinfo unreproducible
Control: severity -1 important

Hi Norbert,

Could you tell me the output of this:

$ for file in /etc/jupyter/nbconfig/*.json; do if [ -f "$file" ] && [ -r "$file" ]; then echo "-- $file"; cat "$file"; echo; fi; done

If any of these files are empty, please could you run, as root:

$ for i in /etc/jupyter/nbconfig/*.json; do if [ -f "$i" -a '!' -s "$i" ]; then rm -f "$i"; fi; done
$ dpkg-reconfigure jupyter-nbextension-jupyter-js-widgets

and then tell me if it fixes your problem?

X

On Tue, 12 Sep 2017 09:56:42 +0900 Norbert Preining <preining at logic.at> wrote:
> Package: jupyter-nbextension-jupyter-js-widgets
> Version: 6.0.0-2
> Severity: serious
> 
> Dear maintainer, 
> 
> the package consistently fails to configure with the following error:
> 
> Setting up jupyter-nbextension-jupyter-js-widgets (6.0.0-2) ...
> /usr/lib/python3.5/runpy.py:125: RuntimeWarning: 'notebook.nbextensions' found in sys.modules after import of package 'notebook', but prior to execution of 'notebook.nbextensions'; this may result in unpredictable behaviour
>   warn(RuntimeWarning(msg))
> Enabling notebook extension jupyter-js-widgets/extension...
> Traceback (most recent call last):
>   File "/usr/lib/python3.5/runpy.py", line 193, in _run_module_as_main
>     "__main__", mod_spec)
>   File "/usr/lib/python3.5/runpy.py", line 85, in _run_code
>     exec(code, run_globals)
>   File "/usr/lib/python3/dist-packages/notebook/nbextensions.py", line 1176, in <module>
>     main()
>   File "/usr/lib/python3/dist-packages/jupyter_core/application.py", line 267, in launch_instance
>     return super(JupyterApp, cls).launch_instance(argv=argv, **kwargs)
>   File "/usr/lib/python3/dist-packages/traitlets/config/application.py", line 658, in launch_instance
>     app.start()
>   File "/usr/lib/python3/dist-packages/notebook/nbextensions.py", line 961, in start
>     super(NBExtensionApp, self).start()
>   File "/usr/lib/python3/dist-packages/jupyter_core/application.py", line 256, in start
>     self.subapp.start()
>   File "/usr/lib/python3/dist-packages/notebook/nbextensions.py", line 871, in start
>     self.toggle_nbextension(self.extra_args[0])
>   File "/usr/lib/python3/dist-packages/notebook/nbextensions.py", line 861, in toggle_nbextension
>     logger=self.log)
>   File "/usr/lib/python3/dist-packages/notebook/nbextensions.py", line 407, in enable_nbextension
>     logger=logger)
>   File "/usr/lib/python3/dist-packages/notebook/nbextensions.py", line 345, in _set_nbextension_state
>     cm.update(section, {"load_extensions": {require: state}})
>   File "/usr/lib/python3/dist-packages/traitlets/config/manager.py", line 85, in update
>     data = self.get(section_name)
>   File "/usr/lib/python3/dist-packages/traitlets/config/manager.py", line 63, in get
>     return json.load(f)
>   File "/usr/lib/python3.5/json/__init__.py", line 268, in load
>     parse_constant=parse_constant, object_pairs_hook=object_pairs_hook, **kw)
>   File "/usr/lib/python3.5/json/__init__.py", line 319, in loads
>     return _default_decoder.decode(s)
>   File "/usr/lib/python3.5/json/decoder.py", line 339, in decode
>     obj, end = self.raw_decode(s, idx=_w(s, 0).end())
>   File "/usr/lib/python3.5/json/decoder.py", line 357, in raw_decode
>     raise JSONDecodeError("Expecting value", s, err.value) from None
> json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)
> dpkg: error processing package jupyter-nbextension-jupyter-js-widgets (--configure):
>  subprocess installed post-installation script returned error exit status 1
> 
> 
> Thanks
> 
> Norbert
> 
> -- System Information:
> Debian Release: buster/sid
>   APT prefers unstable
>   APT policy: (500, 'unstable'), (200, 'experimental')

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