Jupyter Lab issue displaying widgets (javascript error)

Question

I have troubles replicating a JupyterLab install on a new PC. It is working fine on my previous one. I am unable to display simple widgets (like a checkbox from ipywidgets or ipyvuetify). I checked that jupyter-widgets is enabled with jupyter labextension list. The results is :

jupyter-vue v1.7.0 enabled ok
jupyter-vuetify v1.8.4 enabled ok
@jupyter-widgets/jupyterlab-manager v5.0.2 enabled ok (python, jupyterlab_widgets)

In the notebook, when i try to display a widget, the cell displays a Javascrip error :

[Open Browser Console for more detailed log - Double click to close this message]
Failed to load model class 'CheckboxModel' from module '@jupyter-widgets/controls'
Error: Module @jupyter-widgets/controls, version ^1.5.0 is not registered, however, 2.0.0 is 
at f.loadClass (http://localhost:8888/lab/extensions/@jupyter-widgets/jupyterlab-
manager/static/134.083e6b37f2f7b2f04b5e.js?v=083e6b37f2f7b2f04b5e:1:74976)
at f.loadModelClass (http://localhost:8888/lab/extensions/@jupyter-widgets/jupyterlab- 
manager/static/150.467514c324d2bcc23502.js?v=467514c324d2bcc23502:1:10721)
at f._make_model (http://localhost:8888/lab/extensions/@jupyter-widgets/jupyterlab- 
manager/static/150.467514c324d2bcc23502.js?v=467514c324d2bcc23502:1:7517)
at f.new_model (http://localhost:8888/lab/extensions/@jupyter-widgets/jupyterlab- 
manager/static/150.467514c324d2bcc23502.js?v=467514c324d2bcc23502:1:5137)
at f.handle_comm_open (http://localhost:8888/lab/extensions/@jupyter-widgets/jupyterlab- 
manager/static/150.467514c324d2bcc23502.js?v=467514c324d2bcc23502:1:3894)
at _handleCommOpen (http://localhost:8888/lab/extensions/@jupyter-widgets/jupyterlab- 
manager/static/134.083e6b37f2f7b2f04b5e.js?v=083e6b37f2f7b2f04b5e:1:73392)
at b._handleCommOpen (http://localhost:8888/static/lab/jlab_core.86360d749a1ef5f29afb.js? 
v=86360d749a1ef5f29afb:2:924842)
at async b._handleMessage 
(http://localhost:8888/static/lab/jlab_core.86360d749a1ef5f29afb.js? 
v=86360d749a1ef5f29afb:2:926832)

Answer 1

That error is consistent with one noted here in an issue report recently. The suggestion there is to change to ipywidgets version 7.7.2 or 7.6.5 to fix this issue. Also, see the note here, too.

Answer 2

I had the same issue when my ipywidgets version is 7.6.5 After I updated ipywidgets version to 8.0.4, the problem was solved.

Answer 3

I had this problem when executing a notebook on mybinder.com. The environment.yml file contained:

channels:

• conda-forge

dependencies:

• python=3.8.8
• jupyter=1.0.0
• jupyterlab=3.0.14
• ipywidgets=7.5.1
• matplotlib=3.4.1
• numpy=1.20.2
• scipy=1.6.2
• pandas=1.2.4

Running

pip install ipympl==0.9.3

or

conda install ipympl=0.9.3

in Terminal or in Console solved the problem for me.

Answer 4

I wanted to comment under Waynes answer but I can't so here it is. I had the same problem with 8.0.6 I downgraded to 8.0.4 and then it worked!

Answer 5

I ran into a similar error message, enabling the relevant jupyter extension and restarting the kernel solved the problem.

jupyter nbextension enable --py widgetsnbextension

You can find the detailed instructions here

Answer 6

Fixed it for me:

pip install -U ipywidgets

That command changed to these versions:

    Uninstalling ipywidgets-7.6.5:
      Successfully uninstalled ipywidgets-7.6.5
Successfully installed comm-0.2.1 ipywidgets-8.1.2 jupyterlab-widgets-3.0.10 widgetsnbextension-4.0.10