Why I still get Error displaying widget: model not found of ipympl 0.6.2?

[GF-Huang]

Hi @thomasaarholt, so we I need to do now?

[martinRenou]

Do you have widgets working in JupyterLab, what happens if you run:

from ipywidgets import IntSlider
IntSlider()

[martinRenou]

I am tempted to say jupyterlab-plotly is breaking ipympl, the reason is that it might bring an outdated jupyter-widgets version

[martinRenou]

I would try without jupyterlab-plotly until it gets updated for JuptyerLab 3

[jasongrout]

jupyterlab-plotly

The latest release of jupyterlab-plotly is compatible with jlab 3.

They had one release that pulled in an outdated jupyter-widgets version, but then corrected that in a patch release.

[jasongrout]

Yeah, install jupyterlab-plotly 4.14.3 instead of 4.14.1.

[nvaytet]

Hi I am also getting this "Model not found" error on 0.6.3.

All extensions seem ok:

Installed in a fresh conda env:

• jupyter_client 6.1.11 pyhd8ed1ab_1 conda-forge
• jupyter_core 4.7.1 py37h89c1867_0 conda-forge
• jupyter_server 1.3.0 py37h89c1867_0 conda-forge
• jupyterlab 3.0.7 pyhd8ed1ab_0 conda-forge
• ipywidgets 7.6.3 pyhd3deb0d_0 conda-forge
• ipympl 0.6.3 pyhd8ed1ab_0 conda-forge
• matplotlib 3.3.1 1 conda-forge (same result with 3.2.2)
• pythreejs 2.2.1 pyh9f0ad1d_0 conda-forge

Creating a IntSlider() works fine.

Interestingly, using pythreejsshows the same error:

import pythreejs as p3
p3.BoxGeometry(1, 2, 3)

Error displaying widget: model not found

The errors in the Chrome console:

• Error: Module jupyter-matplotlib, semver range ^0.8.3 is not registered as a widget module
• Error: Module jupyter-threejs, semver range ^2.1.0 is not registered as a widget module

I don't know if having pythreejs is causing the issue here.

It all works fine in classic notebook.

Thanks for any help.

[martinRenou]

I don't know if having pythreejs is causing the issue here.

I think it's the source of your issue. pythreejs does not support JupyterLab 3 yet https://github.com/jupyter-widgets/pythreejs/pull/342.

If you really want pythreejs, I suggest using JupyterLab 2 for now. Otherwise, I would nuke this environment, start again with JupyterLab 3 without installing pythreejs this time.

[thomasaarholt]

Agreed with what @martinRenou said :)

[nvaytet]

Thanks, going to JupyterLab 2 fixed it for me.