I modified my post keeping the topic. This is jupyter-3.11 (macOS 11.7.10), installed using macports.
$ jupyter notebook
[I 2025-07-12 23:47:21.720 ServerApp] jupyter_lsp | extension was successfully linked.
[I 2025-07-12 23:47:21.726 ServerApp] jupyter_server_terminals | extension was successfully linked.
[I 2025-07-12 23:47:21.732 ServerApp] jupyterlab | extension was successfully linked.
[I 2025-07-12 23:47:21.737 ServerApp] notebook | extension was successfully linked.
[I 2025-07-12 23:47:22.380 ServerApp] notebook_shim | extension was successfully linked.
[I 2025-07-12 23:47:22.434 ServerApp] notebook_shim | extension was successfully loaded.
[I 2025-07-12 23:47:22.437 ServerApp] jupyter_lsp | extension was successfully loaded.
[I 2025-07-12 23:47:22.440 ServerApp] jupyter_server_terminals | extension was successfully loaded.
[I 2025-07-12 23:47:22.448 LabApp] JupyterLab extension loaded from /opt/local/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/jupyterlab
[I 2025-07-12 23:47:22.448 LabApp] JupyterLab application directory is /opt/local/Library/Frameworks/Python.framework/Versions/3.11/share/jupyter/lab
[I 2025-07-12 23:47:22.449 LabApp] Extension Manager is 'pypi'.
[W 2025-07-12 23:47:22.450 LabApp] Failed to instantiate the extension manager pypi. Falling back to read-only manager.
Traceback (most recent call last):
File "/opt/local/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/jupyterlab/labapp.py", line 837, in initialize_handlers
ext_manager = manager_factory(app_options, listings_config, self)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/local/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/jupyterlab/extensions/__init__.py", line 46, in get_pypi_manager
return PyPIExtensionManager(app_options, ext_options, parent)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/local/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/jupyterlab/extensions/pypi.py", line 130, in __init__
self._httpx_client = httpx.AsyncClient(proxies=proxies)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: AsyncClient.__init__() got an unexpected keyword argument 'proxies'
[I 2025-07-12 23:47:22.456 ServerApp] jupyterlab | extension was successfully loaded.
[I 2025-07-12 23:47:22.460 ServerApp] notebook | extension was successfully loaded.
[I 2025-07-12 23:47:22.461 ServerApp] Serving notebooks from local directory: /Users/kuku/Documents/notebooks
[I 2025-07-12 23:47:22.461 ServerApp] Jupyter Server 2.13.0 is running at:
[I 2025-07-12 23:47:22.461 ServerApp] http://localhost:8888/tree?token=c914162835a88e058fafb8e0950c2048df0fc6072276d989
[I 2025-07-12 23:47:22.462 ServerApp] http://127.0.0.1:8888/tree?token=c914162835a88e058fafb8e0950c2048df0fc6072276d989
[I 2025-07-12 23:47:22.462 ServerApp] Use Control-C to stop this server and shut down all kernels (twice to skip confirmation).
[C 2025-07-12 23:47:22.590 ServerApp]
To access the server, open this file in a browser:
file:///Users/kuku/Library/Jupyter/runtime/jpserver-49066-open.html
Or copy and paste one of these URLs:
http://localhost:8888/tree?token=c914162835a88e058fafb8e0950c2048df0fc6072276d989
http://127.0.0.1:8888/tree?token=c914162835a88e058fafb8e0950c2048df0fc6072276d989
[I 2025-07-12 23:47:23.079 ServerApp] Skipped non-installed server(s): bash-language-server, dockerfile-language-server-nodejs, javascript-typescript-langserver, jedi-language-server, julia-language-server, pyright, python-language-server, python-lsp-server, r-languageserver, sql-language-server, texlab, typescript-language-server, unified-language-server, vscode-css-languageserver-bin, vscode-html-languageserver-bin, vscode-json-languageserver-bin, yaml-language-server
[W 2025-07-12 23:47:25.153 ServerApp] 404 GET /lab/api/settings/@jupyterlab/apputils-extension:kernels-settings?1752356845140 (127.0.0.1): Schema not found: /opt/local/Library/Frameworks/Python.framework/Versions/3.11/share/jupyter/lab/schemas/@jupyterlab/apputils-extension/kernels-settings.json
[W 2025-07-12 23:47:25.153 LabApp] wrote error: 'Schema not found: /opt/local/Library/Frameworks/Python.framework/Versions/3.11/share/jupyter/lab/schemas/@jupyterlab/apputils-extension/kernels-settings.json'
Traceback (most recent call last):
File "/opt/local/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/tornado/web.py", line 1846, in _execute
result = method(*self.path_args, **self.path_kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/local/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/tornado/web.py", line 3375, in wrapper
return method(self, *args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/local/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/jupyterlab_server/settings_handler.py", line 57, in get
result, warnings = get_settings(
^^^^^^^^^^^^^
File "/opt/local/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/jupyterlab_server/settings_utils.py", line 379, in get_settings
schema, version = _get_schema(schemas_dir, schema_name, overrides, labextensions_path)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/local/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/jupyterlab_server/settings_utils.py", line 55, in _get_schema
raise web.HTTPError(404, notfound_error % path)
tornado.web.HTTPError: HTTP 404: Not Found (Schema not found: /opt/local/Library/Frameworks/Python.framework/Versions/3.11/share/jupyter/lab/schemas/@jupyterlab/apputils-extension/kernels-settings.json)
[W 2025-07-12 23:47:25.158 LabApp] 404 GET /lab/api/settings/@jupyterlab/apputils-extension:kernels-settings?1752356845140 (d68cda785160450bb8bb6be539c36b35@127.0.0.1) 9.72ms referer=http://localhost:8888/tree
[W 2025-07-12 23:47:25.561 ServerApp] 404 GET /lab/api/settings/@jupyter-notebook/notebook-extension:full-width-notebook?1752356845421 (127.0.0.1): Schema not found: /opt/local/Library/Frameworks/Python.framework/Versions/3.11/share/jupyter/lab/schemas/@jupyter-notebook/notebook-extension/full-width-notebook.json
[W 2025-07-12 23:47:25.561 LabApp] wrote error: 'Schema not found: /opt/local/Library/Frameworks/Python.framework/Versions/3.11/share/jupyter/lab/schemas/@jupyter-notebook/notebook-extension/full-width-notebook.json'
Traceback (most recent call last):
File "/opt/local/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/tornado/web.py", line 1846, in _execute
result = method(*self.path_args, **self.path_kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/local/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/tornado/web.py", line 3375, in wrapper
return method(self, *args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/local/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/jupyterlab_server/settings_handler.py", line 57, in get
result, warnings = get_settings(
^^^^^^^^^^^^^
File "/opt/local/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/jupyterlab_server/settings_utils.py", line 379, in get_settings
schema, version = _get_schema(schemas_dir, schema_name, overrides, labextensions_path)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/local/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/jupyterlab_server/settings_utils.py", line 55, in _get_schema
raise web.HTTPError(404, notfound_error % path)
tornado.web.HTTPError: HTTP 404: Not Found (Schema not found: /opt/local/Library/Frameworks/Python.framework/Versions/3.11/share/jupyter/lab/schemas/@jupyter-notebook/notebook-extension/full-width-notebook.json)
[W 2025-07-12 23:47:25.563 LabApp] 404 GET /lab/api/settings/@jupyter-notebook/notebook-extension:full-width-notebook?1752356845421 (d68cda785160450bb8bb6be539c36b35@127.0.0.1) 10.74ms referer=http://localhost:8888/tree