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

[willyyang]

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 (#87 (comment)) 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]

Are you able to open a Python prompt and run import dask_labextension?

[willyyang]

@jacobtomlinson seeing this error:

(2021-11-22 16:05:30) (~)

-$ pip list | grep dask

dask                               2021.11.1

dask-labextension                  5.1.0

 

(2021-11-22 16:05:37) (~)

-$ python

Python 3.8.8 (default, Apr 13 2021, 19:58:26)

[GCC 7.3.0] :: Anaconda, Inc. on linux

Type "help", "copyright", "credits" or "license" for more information.

>>> import dask_labextension

Traceback (most recent call last):

  File "<stdin>", line 1, in <module>

  File "/opt/conda/lib/python3.8/site-packages/dask_labextension/__init__.py", line 6, in <module>

    from .clusterhandler import DaskClusterHandler

  File "/opt/conda/lib/python3.8/site-packages/dask_labextension/clusterhandler.py", line 11, in <module>

    from .manager import manager

  File "/opt/conda/lib/python3.8/site-packages/dask_labextension/manager.py", line 12, in <module>

    from dask.distributed import Adaptive, utils

  File "/opt/conda/lib/python3.8/site-packages/dask/distributed.py", line 11, in <module>

    from distributed import *

  File "/opt/conda/lib/python3.8/site-packages/distributed/__init__.py", line 7, in <module>

    from .actor import Actor, ActorFuture

  File "/opt/conda/lib/python3.8/site-packages/distributed/actor.py", line 6, in <module>

    from .client import Future, default_client

  File "/opt/conda/lib/python3.8/site-packages/distributed/client.py", line 30, in <module>

    from dask.compatibility import apply

ImportError: cannot import name 'apply' from 'dask.compatibility' (/opt/conda/lib/python3.8/site-packages/dask/compatibility.py)

[jacobtomlinson]

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

[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? — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#214 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABQZSYJXXI5TCWDQEAU7BXLUNJTRDANCNFSM5IKNN6BQ> . Triage notifications on the go with GitHub Mobile for iOS <https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675> or Android <https://play.google.com/store/apps/details?id=com.github.android&referrer=utm_campaign%3Dnotification-email%26utm_medium%3Demail%26utm_source%3Dgithub>.

[jacobtomlinson]

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