An error occurred installing @jupyterlab/toc-extension.

I’ve just change from jupyter notebook to jupyter lab. When I try to install the toc extension, i got

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
>=2.2.6 <2.3.0          >=3.0.0-beta.8 <4.0.0@jupyterlab/application
>=2.2.4 <2.3.0          >=3.0.0-beta.8 <4.0.0@jupyterlab/docmanager
>=2.2.4 <2.3.0          >=3.0.0-beta.8 <4.0.0@jupyterlab/fileeditor
>=2.2.7 <2.3.0          >=3.0.0-beta.8 <4.0.0@jupyterlab/notebook
>=2.2.4 <2.3.0          >=3.0.0-beta.8 <4.0.0@jupyterlab/rendermime

When I search for the instaleld versions in my device it says that

$ jupyter --version
jupyter core     : 4.6.3
jupyter-notebook : 6.1.4
qtconsole        : 4.7.7
ipython          : 7.18.1
ipykernel        : 5.3.4
jupyter client   : 6.1.7
jupyter lab      : 2.2.9
nbconvert        : 6.0.7
ipywidgets       : 7.5.1
nbformat         : 5.0.8
traitlets        : 5.0.5

which it seems to be compatible.

[lresende]

If you install JupyterLab 3.0, TOC is pre-installed as it moved to be a core-extension.

[KennyNg-19]

same here