Error: Failed to list clusters: might the server extension not be installed/enabled?

I’m running into the error Failed to list clusters: might the server extension not be installed/enabled? after I’ve ran the following steps and start up JupyterLab in JupyterHub:

pip install dask_labextension
jupyter labextension install dask-labextension
jupyter lab build --minimize=False --dev-build=False

I’m able to see dask-labextension v5.1.0 enabled OK (python, dask_labextension) on jupyter labextension list

I’ve also tried following another comment from a similar error thread (https://github.com/dask/dask-labextension/issues/87#issuecomment-553630615) for enabling serverextension after the jupyter lab build.. (didnt really expect this to work since I have jupyter notebook version > 5.2) which results in :

jupyter serveretension enable dask_labextension
Enabling: dask_labextension
- Writing config: /opt/app-root/src/.jupyter
   - Validating...
Error loading server extension dask_labextension
     is dask_labextension importable?

Environment: os: Debian GNU/Linux 10 (buster) python: 3.8.8

installed via pip dask: 2021.11.1 dask-labextension: 5.1.0 jupyterhub: 1.4.2

jupyter --version jupyter core: 4.7.1 jupyter-notebook: 6.4.1 jupyter lab: 3.0.17

Thanks for any help or tips in advance.

[jacobtomlinson]

Awesome. Strange that they managed to get out of sync, we usually hard pin them. Glad it’s working for you.

[willyyang]

Thanks that update worked to align the two package versions.

On Mon, Nov 22, 2021 at 8:10 AM Jacob Tomlinson @.***> wrote:

Ok thanks. Looks like some issue between Dask and Distirbuted. I see you have dask 2021.11.1. Does your distributed version match that?

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