When I updated JupyterLab, I was asked to update the extension, so as I was told, jupyterlab-git disappeared from the menu bar on the left.
As described in Troubleshooting in jupyterlab-git's GitHub
$ jupyter serverextension list
$ jupyter labextension list
When I executed, the same error as this article occurred, so the json file that caused the bug was deleted.
Furthermore, the version of server extension and lab extension must be the same, but it seems that v0.21.0 of lab extension is out now, and when lab extension is installed on Jupyter Lab, the version is different from the latest version v0.20.0 of server extension. I will end up.
Therefore
$ jupyter labextension uninstall @jupyterlab/git
$ jupyter labextension install @jupyterlab/[email protected]
It was fixed when I rebuilt it with the same version. tired……
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