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

[jeschwar]

I am trying to run the following powershell command in Windows 10:

jupyter labextension install @jupyter-widgets/jupyterlab-manager

The ValueError in the subject-line is raised. Below are some relevant version numbers from my Anaconda installation:

• python 3.6.4 64-bit
• conda 4.3.34
• notebook 5.4.0
• ipywidgets 7.1.2
• jupyter 1.0.0
• jupyterlab 0.31.8
• npm 1.4.12
• nodejs 8.9.1

and here is the output after using the --debug option:

PS C:\Users\jeschwar> jupyter labextension install @jupyter-widgets/jupyterlab-manager --debug
> C:\Anaconda3_64bit\Scripts\npm.CMD pack @jupyter-widgets/jupyterlab-manager
npm ERR! addLocal Could not install jupyter-widgets/jupyterlab-manager
npm ERR! Error: ENOENT: no such file or directory, stat 'C:\Users\jeschwar\AppData\Local\Temp\tmpusxl33eq\jupyter-widgets\jupyterlab-manager'
npm ERR! If you need help, you may report this *entire* log,
npm ERR! including the npm and node versions, at:
npm ERR!     <http://github.com/npm/npm/issues>

npm ERR! System Windows_NT 10.0.10586
npm ERR! command "C:\\Anaconda3_64bit\\node.exe" "C:\\Anaconda3_64bit\\Library\\lib\\node_modules\\npm\\bin\\npm-cli.js" "pack" "@jupyter-widgets/jupyterlab-manager"
npm ERR! cwd C:\Users\jeschwar\AppData\Local\Temp\tmpusxl33eq
npm ERR! node -v v8.9.1
npm ERR! npm -v 1.4.12
npm ERR! path C:\Users\jeschwar\AppData\Local\Temp\tmpusxl33eq\jupyter-widgets\jupyterlab-manager
npm ERR! syscall stat
npm ERR! code ENOENT
npm ERR! errno -4058
npm ERR!
npm ERR! Additional logging details can be found in:
npm ERR!     C:\Users\jeschwar\AppData\Local\Temp\tmpusxl33eq\npm-debug.log
npm ERR! not ok code 0
Traceback (most recent call last):

  File "C:\Anaconda3_64bit\lib\site-packages\jupyterlab\labextensions.py", line 71, in start
    ans = self.run_task()

  File "C:\Anaconda3_64bit\lib\site-packages\jupyterlab\labextensions.py", line 100, in run_task
    for arg in self.extra_args

  File "C:\Anaconda3_64bit\lib\site-packages\jupyterlab\labextensions.py", line 100, in <listcomp>
    for arg in self.extra_args

  File "C:\Anaconda3_64bit\lib\site-packages\jupyterlab\commands.py", line 210, in install_extension
    return handler.install_extension(extension)

  File "C:\Anaconda3_64bit\lib\site-packages\jupyterlab\commands.py", line 347, in install_extension
    info = self._install_extension(extension, tempdir)

  File "C:\Anaconda3_64bit\lib\site-packages\jupyterlab\commands.py", line 1095, in _install_extension
    info = self._extract_package(extension, tempdir)

  File "C:\Anaconda3_64bit\lib\site-packages\jupyterlab\commands.py", line 1135, in _extract_package
    raise ValueError(msg % source)

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


Errored, use --debug for full output:
ValueError: "@jupyter-widgets/jupyterlab-manager" is not a valid npm package

I realize the output says to create an issue in npm/npm but I thought I would start here because everything works fine when I tried this in Linux including the ipywidgets displaying correctly in JupyterLab.

Is this extension currently supported in Windows 10?

[jasongrout]

It looks like the relevant line is:

npm ERR! Error: ENOENT: no such file or directory, stat 'C:\Users\jeschwar\AppData\Local\Temp\tmpusxl33eq\jupyter-widgets\jupyterlab-manager'

Does that directory exist? Huh - why does it not have the @? Perhaps in windows things need to be quoted? I think @ may be a comment character?

Can you try jupyter labextension install "@jupyter-widgets/jupyterlab-manager"?

[jasongrout]

I think @ may be a comment character?

Probably not a comment character, but still maybe a special character for some reason? Can you try the quoted version?

[jeschwar]

Sure. I tried the following commands with no success:

jupyter labextension install "@jupyter-widgets/jupyterlab-manager"
jupyter labextension install "jupyter-widgets/jupyterlab-manager"
jupyter labextension install jupyter-widgets/jupyterlab-manager

I can see the strange tmp... directory created but then it is deleted after about 1 second.

I'm not sure whether using the npm installer directly is supposed to work but it gave the following output:

PS C:\Users\jeschwar> npm i @jupyter-widgets/jupyterlab-manager
npm WARN saveError ENOENT: no such file or directory, open 'C:\Users\jeschwar\package.json'
npm notice created a lockfile as package-lock.json. You should commit this file.
npm WARN enoent ENOENT: no such file or directory, open 'C:\Users\jeschwar\package.json'
npm WARN jeschwar No description
npm WARN jeschwar No repository field.
npm WARN jeschwar No README data
npm WARN jeschwar No license field.

+ @jupyter-widgets/[email protected]
added 100 packages in 68.827s

however ipywidgets are not displayed in JupyterLab

[jasongrout]

The npm install command won't do what you want. I'll try to set up a windows setup to see if I can reproduce this error.

[jasongrout]

Does it work outside of powershell, in the normal windows cmd.exe?

[vidartf]

npm 1.4.12

This seems awfully low (it was released in 2014). Could you try updating it?

[jeschwar]

Looks like the issue was with my npm installation.

When I was initially trying to get JupyterLab working it gave me the following exception from jupyterlab.commands._node_check():

Please install nodejs 5+ and npm before continuing. nodejs may be installed using conda or directly from the nodejs website.

so I used the following commands to install these packages:

conda install -c conda-forge nodejs
conda install -c cpcloud npm

Today I was reading on www.npmjs.com that npm is included whenever one installs nodejs. I ran the following commands to change my installation:

conda remove nodejs npm
conda install -c conda-forge nodejs

I repeated the jupyter labextension install @jupyter-widgets/jupyterlab-manager command and everything works now including ipywidgets displaying correctly in JupyterLab.

I guess the old npm package was over-writing the npm.cmd file which was installed by the nodejs package.

[attibalazs]

I just tried reinstalling nodejs as specified above, i get a 'Filename too long' error

(base) C:\Users\b>conda install -c conda-forge nodejs
Solving environment: done

## Package Plan ##

  environment location: C:\Users\b\AppData\Local\Continuum\anaconda3

  added / updated specs:
    - nodejs


The following packages will be downloaded:

    package                    |            build
    ---------------------------|-----------------
    nodejs-9.11.1              |                0        12.6 MB  conda-forge

The following NEW packages will be INSTALLED:

    nodejs:          9.11.1-0          conda-forge

The following packages will be UPDATED:

    ca-certificates: 2018.03.07-0                  --> 2018.4.16-0      conda-forge
    certifi:         2018.4.16-py36_0              --> 2018.4.16-py36_0 conda-forge
    conda:           4.5.4-py36_0                  --> 4.5.4-py36_0     conda-forge
    openssl:         1.0.2o-h8ea7d77_0             --> 1.0.2o-vc14_0    conda-forge [vc14]

Proceed ([y]/n)? y


Downloading and Extracting Packages
nodejs-9.11.1        | 12.6 MB | ###########################################################6                    |  76%

FileNotFoundError(2, 'The filename or extension is too long')

[steviestevepy]

I had to rollback to earlier version of nodejs (v8) in order to install jupyter labextension install @jupyter-widgets/[email protected]
I hope it will be of help to anyone as I was stuck for a while.
Thanks

[hainm]

thanks @stevenwinfield. It does help my case too (not working with nodejs 11).

[PuncocharM]

I have the same issue on Windows 10, tried it with different versions of NodeJS (8,10,11). I finally fixed it by commenting out line 1321 in \

ret = self._run([which('npm'), 'pack', source], cwd=tempdir, quiet=quiet)
if ret != 0:
    msg = '"%s" is not a valid npm package'
    #raise ValueError(msg % source)   <----
    print(msg)

The problem seems to be that npm returns non-zero exit code even though it installs the package correctly.

[choonsiong]

Face the same error message, and got it works using sudo:

(base) 00:20:15:69 ~ sudo jupyter labextension install @jupyter-widgets/jupyterlab-manager
Password:
Building jupyterlab assets (build:prod:minimize)
(base) 00:23:52:69 ~