Jupyter Lab extensions 1.5.2 fails to display widgets

[andrei91ro]

After having build issues with version 1.5.1 of the jupyter lab extension (discussed and solved in #2223 ) I am now faced with runtime problems: the widget does not start and the plot is not shown.

I am seeing only a blank container where the plot should be. If I use a widget, I only see a loading widget ... message that never changes.

I installed the exact versions (for python and JS versions of plotly) as stated in the update README.
The only difference is that I am using Jupyter lab 1.2.6 vs 1.2.0 from the Readme.

Can this be the cause of my problem?

The browser console contains the following output:

Could not instantiate widget manager-base.js:273:32
    _make_model manager-base.js:273
    l manager-base.js:44
    s manager-base.js:25
    s manager-base.js:17
Error: "Could not create a model."
    n utils.js:119
utils.js:119:20
    n utils.js:119
Exception opening new comm default.js:992:24
    _handleCommOpen default.js:992
Error: Module plotlywidget, semver range 1.5.2 is not registered as a widget module manager.js:305:18
Error: "Module plotlywidget, semver range 1.5.2 is not registered as a widget module"
    loadClass manager.js:305
    _make_model manager-base.js:263
    l manager-base.js:44
    s manager-base.js:25
    L manager-base.js:19
    L manager-base.js:15
    _make_model manager-base.js:257
    new_model manager-base.js:246
    l manager-base.js:44
    s manager-base.js:25
    L manager-base.js:19
    L manager-base.js:15
    new_model manager-base.js:232
    handle_comm_open manager-base.js:144
    _handleCommOpen manager.js:62
    _handleCommOpen default.js:990
default.js:111:74
    _msgChain default.js:111
Error: Module plotlywidget, semver range 1.5.2 is not registered as a widget module manager.js:305:18

Thank you for your kind help and congrats for Plotly!

[andrei91ro]

It seems that now, after a clean reinstall of update versions of plotly-jupyterlab (see config below), everything works fine out-of-the-box.
So, I'm closing this issue and I thank the developers!

 > jupyter-labextension list

JupyterLab v2.0.1
Known labextensions:
   app dir: /home/andrei/.local/share/jupyter/lab
        @jupyterlab/toc v3.0.0  enabled  OK
        jupyterlab-plotly v1.5.4  enabled  OK
        plotlywidget v1.5.4  enabled  OK