when building show ‘AppOptions’ object has no attribute ‘extensions’

[freemedom]

https://discourse.jupyter.org/t/appoptions-object-has-no-attribute-extensions/11487

[freemedom]

when use
pip install lckr-jupyterlab-variableinspector
show:
ERROR: Invalid requirement: 'jupyterlab,==3.*'

[freemedom]

i finally solve this problem by
https://teratail.com/questions/348800

[michaelwooley]

@freemedom 's link does appear to work. Thanks! Here is the command:

jupyter labextension install @lckr/jupyterlab_variableinspector@3.0.7

• 3.0.7 is the latest tagged release
• It appears that pinning to 3.0.7 is critical to getting the build to work.
• v3.0.9 is currently on npm? If 3.0.9 is unstable then I'm not surprised that it didn't work.

Somehow this also fixed a lot of my other extensions by causing "linkages" to occur?! (I don't think that this extension broke those extensions.)