Jupyter Extension Installs Fail as Not Valid NPM Package

Question

I am trying to install the Jupyter Plotly extensions per their directions, see section heading: JupyterLab Support (Python 3.5+). However, installation of any package listed fails with a ValueError...not a valid npm package. In full disclosure, this is my first stackoverflow post. If information is missing, please let me know. I'm an engineer that uses Python, not someone deeply versed in the underlying toolsets.

System

Windows 10
Python 3.7.5
node 12.13.0
npm 6.9.0

I don't know if this is pertinent but I am trying to do this installation from withing a python environment. What I did before attempting extension installation (beware: no idea what best practice is).

Created folder for python environments folder (>c:\projects\python\environments)
In new folder, created jupyterLab environment (>python -m venv jupyterLab)
Started shell (>jupyterLab\Scripts\activate.bat)
Installed Jupyter Lab (>*pip install jupyter lab)
Verified Jupyter Lab opens and works

Next I tried to install the ploty extensions as graphs were not rendering.

Command line entry

jupyter labextension install @jupyter-widgets/jupyterlab-manager@1.0 --no-build

Result

ValueError: "@jupyter-widgets/jupyterlab-manager@1.0" is not a valid npm package

I get this error no matter which package or version I try to install from Plotly's directions.

Things tried

Python 3.8.0
Uninstalled and reinstalled nodejs and npm
Rolled back Juptyer Labs to v 1.0.0
Rolled back NPM to various versions from 6.7 through 6.13
Checked that nodejs in path (suggested in a forum)
Check that C:\Users{myUserId}\AppData\Roaming\npm was in path (suggested in a forum)
Good-ole standby...restarted computer

Log output

Node v12.13.0

C:\Program Files\nodejs\npm.CMD" pack @jupyter-widgets/jupyterlab-manager@1.0npm notice
npm notice package: @jupyter-widgets/jupyterlab-manager@1.0.3
npm notice === Tarball Contents === 
npm notice 2.3kB  package.json        
npm notice 1.5kB  LICENSE             
npm notice 1.9kB  README.md           
npm notice 277B   lib/index.d.ts      
npm notice 380B   lib/index.js        
npm notice 5.4kB  lib/manager.d.ts    
npm notice 14.0kB lib/manager.js      
npm notice 1.9kB  lib/output.d.ts     
npm notice 5.2kB  lib/output.js       
npm notice 830B   lib/plugin.d.ts     
npm notice 6.7kB  lib/plugin.js       
npm notice 956B   lib/renderer.d.ts   
npm notice 3.3kB  lib/renderer.js     
npm notice 216B   lib/semvercache.d.ts
npm notice 862B   lib/semvercache.js  
npm notice 375B   schema/plugin.json  
npm notice === Tarball Details === 
npm notice name:          @jupyter-widgets/jupyterlab-manager         
npm notice version:       1.0.3                                       
npm notice filename:      jupyter-widgets-jupyterlab-manager-1.0.3.tgz
npm notice package size:  11.8 kB                                     
npm notice unpacked size: 46.2 kB                                     
npm notice shasum:        48f60ba3224327a7af21aef0edf9400202c3f34f    
npm notice integrity:     sha512-/VNnECOfq731D[...]wRYjB2nuNGpeg==    
npm notice total files:   16                                          
npm notice 
jupyter-widgets-jupyterlab-manager-1.0.3.tgz

Traceback (most recent call last):

  File "c:\projects\python\environments\jupyterlabs\lib\site-packages\jupyterlab\debuglog.py", line 47, in debug_logging
    yield

  File "c:\projects\python\environments\jupyterlabs\lib\site-packages\jupyterlab\labextensions.py", line 82, in start
    ans = self.run_task()

  File "c:\projects\python\environments\jupyterlabs\lib\site-packages\jupyterlab\labextensions.py", line 103, in run_task
    for arg in self.extra_args

  File "c:\projects\python\environments\jupyterlabs\lib\site-packages\jupyterlab\labextensions.py", line 103, in <listcomp>
    for arg in self.extra_args

  File "c:\projects\python\environments\jupyterlabs\lib\site-packages\jupyterlab\commands.py", line 316, in install_extension
    return handler.install_extension(extension)

  File "c:\projects\python\environments\jupyterlabs\lib\site-packages\jupyterlab\commands.py", line 517, in install_extension
    info = self._install_extension(extension, tempdir)

  File "c:\projects\python\environments\jupyterlabs\lib\site-packages\jupyterlab\commands.py", line 1373, in _install_extension
    info = self._extract_package(extension, tempdir)

  File "c:\projects\python\environments\jupyterlabs\lib\site-packages\jupyterlab\commands.py", line 1444, in _extract_package
    raise ValueError(msg % source)

ValueError: "@jupyter-widgets/jupyterlab-manager@1.0" is not a valid npm package

Exiting application: jupyter

Any help would be greatly appreciated. Thanks!

Were you able to find something @Jeff Dawson – Vijay Oct 06 '20 at 16:56 — Vijay, Oct 06 '20 at 16:56
Were you able to find something +1 – Man Man Yu Dec 11 '20 at 05:47 — Man Man Yu, Dec 11 '20 at 05:47

score 1 · Answer 1 · answered May 10 '21 at 08:28

It is an old question, but if anyone else encounter a similar problem, then:

I had a similar problem trying to install the jupyterlab/toc. In the end it seems my problem was caused by my company VPN solution (Zscaler) and logging out of it I was able to install the extension with no problems.

If you are not just able to log off, then you might find inspiration for a solution in https://stackoverflow.com/a/45884819/5816356. For me this made npm happy, but then I had a similar issue with yarn and instead of solving that I just logged off zscaler.

score 0 · Answer 2 · answered Dec 16 '20 at 08:42

I think you can try jupyter labextension install "@jupyter-widgets/jupyterlab-manager" first. If it does not work. You run jupyter labextenison list and delete the widget taz file in extensions.

I develop the extebsion in local, always get the error. My system is MacOS. But I think you can have a try.

Jupyter Extension Installs Fail as Not Valid NPM Package

2 Answers2