ipywidgets don't work on virtualenv

Hello all, When i start jupyter i have the next msg [IPKernelApp] ERROR | No such comm target registered: jupyter.widget.version and nothing happen when i try use ipywidgets in my jupyter-notebook

The step I’ve been doing from the starts when i creation my virtuelenv :

~ python3 -m virtualenv jupyter-notebook
~ pip3 install jupyter
 ~ jupyter nbextension enable --py --sys-prefix widgetsnbextension
Enabling notebook extension jupyter-js-widgets/extension...
      - Validating: OK

~ jupyter-notebook and i have thisin stdout

[I 20:49:51.447 NotebookApp] Serving notebooks from local directory: /home/iah
[I 20:49:51.447 NotebookApp] The Jupyter Notebook is running at:
[I 20:49:51.447 NotebookApp] http://localhost:8888/
[I 20:49:51.447 NotebookApp] Use Control-C to stop this server and shut down all kernels (twice to skip confirmation).
[W 20:49:55.116 NotebookApp] 404 GET /api/kernels/5f273170-5379-4e1f-a1e1-7e1aad4dd924/channels?session_id=dbe4008897bc4d52901320704498afe5 (127.0.0.1): Kernel does not exist: 5f273170-5379-4e1f-a1e1-7e1aad4dd924
[W 20:49:55.154 NotebookApp] 404 GET /api/kernels/5f273170-5379-4e1f-a1e1-7e1aad4dd924/channels?session_id=dbe4008897bc4d52901320704498afe5 (127.0.0.1) 55.74ms referer=None
[I 20:50:05.445 NotebookApp] Kernel started: 112db463-d31d-4e35-98d9-0db3b00fb107
[I 20:50:06.062 NotebookApp] Adapting to protocol v5.1 for kernel 112db463-d31d-4e35-98d9-0db3b00fb107
[IPKernelApp] ERROR | No such comm target registered: jupyter.widget.version
[IPKernelApp] ERROR | No such comm target registered: jupyter.widget.version

and what i have in my virtualenv

 ~ pip freeze
backcall==0.1.0
bleach==3.0.2
decorator==4.3.0
defusedxml==0.5.0
entrypoints==0.2.3
ipykernel==5.1.0
ipython==7.1.1
ipython-genutils==0.2.0
ipywidgets==7.4.2
jedi==0.13.1
Jinja2==2.10
jsonschema==2.6.0
jupyter==1.0.0
jupyter-client==5.2.3
jupyter-console==6.0.0
jupyter-core==4.4.0
MarkupSafe==1.0
mistune==0.8.4
nbconvert==5.4.0
nbformat==4.4.0
notebook==5.7.0
pandocfilters==1.4.2
parso==0.3.1
pexpect==4.6.0
pickleshare==0.7.5
prometheus-client==0.4.2
prompt-toolkit==2.0.7
ptyprocess==0.6.0
Pygments==2.2.0
python-dateutil==2.7.5
pyzmq==17.1.2
qtconsole==4.4.2
Send2Trash==1.5.0
six==1.11.0
terminado==0.8.1
testpath==0.4.2
tornado==5.1.1
traitlets==4.3.2
wcwidth==0.1.7
webencodings==0.5.1
widgetsnbextension==3.4.2

[freiburgermsu]

This error is accompanied for me with a The kernel for ___ appears to have died. It will restart automatically. error that never resolves.

[jasongrout]

Since ipywidgets nominally works in venv environments, likely this is a problem with the specific installation and older packages that had been installed, etc. My shot-in-the-dark guess is that this is a problem with the interaction between user-level and environment-level paths in Jupyter, combined with old packages being installed at the user level. We recently addressed a situation where ipywidgets installed in a venv was broken over in https://github.com/jupyter-widgets/ipywidgets/issues/3559. The solution there was to (a) delete old ipywidgets packages in ~/.local/jupyter, and (b) set the JUPYTER_PREFER_ENV_PATH environment variable to prefer packages installed in the environment over packages installed in the user-level directories.

For whoever is having this problem: can you (a) don’t use jupyter labextension install - just installing recent ipywidgets versions should automatically install the JupyterLab 3 extension, and (b) check jupyter --paths --debug to see where Jupyter is picking up extensions, and © do jupyter labextension list to see what versions and where the lab extension was coming from?

we wait a few more years?

Please be kind. I think that comment was unnecessarily sarcastic.