JupyterLab 3.x "Model not found" error

[FuriouslyCurious]

Heads up for the dev: I am trying out MeshPlot examples in latest JupyterLab 3.0, but unfortunately getting following error message:

Error displaying widget: model not found

All packages are installed correctly and jupyter lab extensions including pythreejs are enabled.

[kpj]

I am also experiencing this issue. Has any solution been found?

[stigersh]

I'm struggling with it for days and there's no source I found stating the versions that needed for compatibility of other packages. This is very painful:(

[ivanpuhachov]

Adding mp.jupyter() solves the issue.