This extension cannot be found in jupterlab, error reported after installation through cmd, internal error 500 ,why?

[x83443647629]

This extension cannot be found in jupterlab, error reported after installation through cmd, internal error 500 ,why?

[Kamil Mielczarek]

I agree, it took me a while to find out that this was the culprit. It only started after a recent conda upgrade.

JupyterLab v1.2.6

[Skipper Seabold]

Duplicated by #130 and #131.