An error occurred installing @jupyterlab/toc-extension.

[qizhengyang2017]

I used the command line below to install toc-extension.

jupyter labextension install jupyterlab-toc

It returned an error:

Extension Installation Error
An error occurred installing @jupyterlab/toc-extension.
Error message:
No version of @jupyterlab/toc-extension could be found that is compatible with the current version of JupyterLab. However, it seems to support a new version of JupyterLab. Consider upgrading JupyterLab.

Conflicting Dependencies:
JupyterLab              Extension      Package
>=2.2.4 <2.3.0          >=3.0.7 <4.0.0 @jupyterlab/application
>=2.2.2 <2.3.0          >=3.0.7 <4.0.0 @jupyterlab/docmanager
>=2.2.2 <2.3.0          >=3.0.7 <4.0.0 

$jupyter lab --version
2.2.6

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[fcollonval]

Hey @qizhengyang2017 this extension has been merged within JupyterLab starting from v3. Hence the error you're seeing. The good news is that you actually don't need to do anything more than installing JupyterLab 3.

[DonovanAD]

Hello, I just installed jupyter lab 3.0.7 and I don't see the TOC anywhere. Here is what I see:

Is there something that I can do to fix this?

[fcollonval]

@DonovanAD I transfer your issue as the context is different