ModuleNotFoundError: No module named 'jupyter_server.contents' switching to Python kernel

[Charles-Gagnon]

Started seeing this after the installing the 6.5.5 version of the notebook package for the python kernel. Unclear exactly what's causing it currently though.

While this issue was caused by switching to 6.5.5 (through the RC1 build) it also affects stable so seems to be something related to the packages themselves.

Failed to change kernel. Kernel SQL will be used. Error was: Notebook process exited prematurely with error code: 1. StdErr Output: Traceback (most recent call last):
  File "C:\Users\chgagnon\AppData\Roaming\Python\Python38\site-packages\notebook\traittypes.py", line 235, in _resolve_classes
    klass = self._resolve_string(klass)
  File "C:\Users\chgagnon\AppData\Roaming\Python\Python38\site-packages\traitlets\traitlets.py", line 2009, in _resolve_string
    return import_item(string)
  File "C:\Users\chgagnon\AppData\Roaming\Python\Python38\site-packages\traitlets\utils\importstring.py", line 30, in import_item
    module = __import__(package, fromlist=[obj])
ModuleNotFoundError: No module named 'jupyter_server.contents'

Additional info:

1. Here's the PR that introduced the line that's failing : Allow jupyter_server-based contents managers in notebook jupyter/notebook#5957
2. Changing line 1411 in $(Python)\Python38\site-packages\notebook\notebookapp.py from

'jupyter_server.contents.services.managers.ContentsManager'

to

'jupyter_server.services.contents.manager.ContentsManager'

seems to fix the issue.

[Charles-Gagnon]

Filed jupyter/notebook#7048

[Charles-Gagnon]

#24443 will be used to track this

[anuragdogra2192]

The same issue with notebook 6.5.4

[Miguel-TX]

The Workaround:
    Uninstall the Recent Problematic Release (v5.10.0) and Install the Prior Version (v5.9.0).

Command Line:

pip uninstall traitlets
pip install traitlets==5.9.0

After I did this, I was finally able to open up my Jupyter Notebook (via Anaconda3) without the OP's error.

[jeapenach]

thanks @Miguel-TX, that worked for me

[sauravmishra1710]

+1, @Miguel-TX that worked for me as well...

[KWagnerCS]

Thanks @Miguel-TX, it worked 👍

[Charles-Gagnon]

For anyone else hitting this - we just released a new version of ADS which checks to make sure that traitlets package is 5.9.0. So if you update to the latest version then that should handle it for you.

[maxi-musz]

The Workaround:     Uninstall the Recent Problematic Release (v5.10.0) and Install the Prior Version (v5.9.0).

Command Line:

pip uninstall traitlets
pip install traitlets==5.9.0

After I did this, I was finally able to open up my Jupyter Notebook (via Anaconda3) without the OP's error.

Thanks man it worked

[REBECCANI]

Thank you @Miguel-TX. It worked

[Ctrl-Jay]

The Workaround: Uninstall the Recent Problematic Release (v5.10.0) and Install the Prior Version (v5.9.0).

Command Line:

pip uninstall traitlets
pip install traitlets==5.9.0

After I did this, I was finally able to open up my Jupyter Notebook (via Anaconda3) without the OP's error.

Thanks @Miguel-TX this was very helpful

[Kushagra128]

thanks that works 🙏

[Apurva710555]

pip install traitlets==5.9.0

worked for me as well

[lollipop190]

The Workaround:     Uninstall the Recent Problematic Release (v5.10.0) and Install the Prior Version (v5.9.0).

Command Line:

pip uninstall traitlets
pip install traitlets==5.9.0

After I did this, I was finally able to open up my Jupyter Notebook (via Anaconda3) without the OP's error.↳

lifesaver, genius!

[Wieso97]

You are my hero @Miguel-TX . Love from china

[benzi604]

The Workaround:     Uninstall the Recent Problematic Release (v5.10.0) and Install the Prior Version (v5.9.0).

Command Line:

pip uninstall traitlets
pip install traitlets==5.9.0

After I did this, I was finally able to open up my Jupyter Notebook (via Anaconda3) without the OP's error.

Thanks a lot!

[Addic021101]

pip install traitlets==5.9.0

broo you are good it worked for me too thanks man saved my day bro

[JuanPalomeque]

Thanks @Miguel-TX, It worked!

[Aashir-tech]

Thanks man , It worked

[Abhishek-Ramamurthy]

Thanks @Miguel-TX. It worked for me too!

[sebgobb]

Thanks @Miguel-TX ! It worked too ! :)

[bandari-thiru]

The Workaround:     Uninstall the Recent Problematic Release (v5.10.0) and Install the Prior Version (v5.9.0).

Command Line:

pip uninstall traitlets
pip install traitlets==5.9.0

After I did this, I was finally able to open up my Jupyter Notebook (via Anaconda3) without the OP's error.

It works, awsome!!!

[RubTalha]

https://stackoverflow.com/a/77549554/13086128

[Amik-TJ]

The Workaround:     Uninstall the Recent Problematic Release (v5.10.0) and Install the Prior Version (v5.9.0).

Command Line:

pip uninstall traitlets
pip install traitlets==5.9.0

After I did this, I was finally able to open up my Jupyter Notebook (via Anaconda3) without the OP's error.

It worked. Thanks a lot

[SeeenyaOhar]

The Workaround:     Uninstall the Recent Problematic Release (v5.10.0) and Install the Prior Version (v5.9.0).

Command Line:

pip uninstall traitlets
pip install traitlets==5.9.0

After I did this, I was finally able to open up my Jupyter Notebook (via Anaconda3) without the OP's error.

Works perfectly!

[MartinUQ]

pip install traitlets==5.9.0

For me 5.8.0 did the job on macos

[Bhavil-Ahuja]

Thanks @Charles-Gagnon for the solution!

[henry3556108]

thx @Miguel-TX it work for me too

[WK-Shim]

The Workaround:     Uninstall the Recent Problematic Release (v5.10.0) and Install the Prior Version (v5.9.0).
Command Line:

pip uninstall traitlets
pip install traitlets==5.9.0

After I did this, I was finally able to open up my Jupyter Notebook (via Anaconda3) without the OP's error.

Thanks man it worked

Thanks!! it worked very well

[White-Lucifer-002]

Thanks!! I had the same issue. It worked for me.

[Morten202]

Please anyone can help bc i have been battling with this for the past 3 days. It didn't open the camera at the module
(base) C:\Users\matek\avatarify-python>run_windows.bat
Traceback (most recent call last):
File "afy/cam_fomm.py", line 6, in
import requests
ModuleNotFoundError: No module named 'requests'

(avatarify) C:\Users\matek\avatarify-python>

[pm80]

The Workaround:     Uninstall the Recent Problematic Release (v5.10.0) and Install the Prior Version (v5.9.0).

Command Line:

pip uninstall traitlets
pip install traitlets==5.9.0

After I did this, I was finally able to open up my Jupyter Notebook (via Anaconda3) without the OP's error.

notebook==6.5.5
traitlets==5.9.0
Django
django-extensions
jupyter

[pm80]

notebook==6.5.5
traitlets==5.9.0
Django
django-extensions
jupyter

[arturomoncadatorres]

pip uninstall traitlets
pip install traitlets==5.9.0

For the sake of completeness, this can also be done with conda:

conda install traitlets=5.9.0

(Note the use of a single = instead of ==)

Don't worry, this won't install two versions of traitlets. conda will perform the downgrade automatically.

[YizhouZ0v0]

The Workaround:     Uninstall the Recent Problematic Release (v5.10.0) and Install the Prior Version (v5.9.0).

Command Line:

pip uninstall traitlets
pip install traitlets==5.9.0

After I did this, I was finally able to open up my Jupyter Notebook (via Anaconda3) without the OP's error.

It worked for me. Thanks!!

[RubTalha]

https://stackoverflow.com/a/77549554/13086128

[hlnull]

https://stackoverflow.com/a/77549554/13086128

Tried pip install traitlets==5.9.0 and met the following error:

ipython 8.27.0 requires traitlets>=5.13.0, but you have traitlets 5.9.0 which is incompatible.

Upgrade the notebook helps.

pip install --upgrade --no-cache-dir notebook==6.*