【Python】ModuleNotFoundError: No module named ‘jupyter_server.contents‘

When I used Jupyter Notebook on Pycharm, I found that it could not be used normally and Jupyter Server could not be pulled up normally.

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The specific error report is:

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'

I also got the same error when I ran it in terminal.jupyter notebook

  File "/home/yaseen/anaconda3/envs/ptenv/lib/python3.11/site-packages/notebook/traittypes.py", line 235, in _resolve_classes
    klass = self._resolve_string(klass)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/yaseen/anaconda3/envs/ptenv/lib/python3.11/site-packages/traitlets/traitlets.py", line 2009, in _resolve_string
    return import_item(string)
           ^^^^^^^^^^^^^^^^^^^
  File "/home/yaseen/anaconda3/envs/ptenv/lib/python3.11/site-packages/traitlets/utils/importstring.py", line 30, in import_item
    module = __import__(package, fromlist=[obj])
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
**ModuleNotFoundError: No module named 'jupyter_server.contents'**

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/yaseen/anaconda3/envs/ptenv/bin/jupyter-notebook", line 10, in <module>
    sys.exit(main())
             ^^^^^^
  File "/home/yaseen/anaconda3/envs/ptenv/lib/python3.11/site-packages/jupyter_core/application.py", line 285, in launch_instance
    return super().launch_instance(argv=argv, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/yaseen/anaconda3/envs/ptenv/lib/python3.11/site-packages/traitlets/config/application.py", line 1044, in launch_instance
    app = cls.instance(**kwargs)
          ^^^^^^^^^^^^^^^^^^^^^^
  File "/home/yaseen/anaconda3/envs/ptenv/lib/python3.11/site-packages/traitlets/config/configurable.py", line 555, in instance
    inst = cls(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^
  File "/home/yaseen/anaconda3/envs/ptenv/lib/python3.11/site-packages/traitlets/traitlets.py", line 1295, in __new__
    inst.setup_instance(*args, **kwargs)
  File "/home/yaseen/anaconda3/envs/ptenv/lib/python3.11/site-packages/traitlets/traitlets.py", line 1338, in setup_instance
    super(HasTraits, self).setup_instance(*args, **kwargs)
  File "/home/yaseen/anaconda3/envs/ptenv/lib/python3.11/site-packages/traitlets/traitlets.py", line 1314, in setup_instance
    init(self)
  File "/home/yaseen/anaconda3/envs/ptenv/lib/python3.11/site-packages/notebook/traittypes.py", line 226, in instance_init
    self._resolve_classes()
  File "/home/yaseen/anaconda3/envs/ptenv/lib/python3.11/site-packages/notebook/traittypes.py", line 238, in _resolve_classes
    warn(f"{
      
      klass} is not importable. Is it installed?", ImportWarning)
TypeError: warn() missing 1 required keyword-only argument: 'stacklevel'

Downgrading to version also fixed it in my case:

conda install traitlets==5.9.0 -c conda-forge

After this, you can use it smoothly!

【Python】ModuleNotFoundError: No module named ‘jupyter_server.contents‘

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