Anaconda not launching JupyterLab

pflueger · February 11, 2022, 8:17pm

I am unable to launch JupyterLab (3.2.1) from Anaconda. (I am able to launch Jupyter Notebook)
I have attempted to downgrade from an earlier version of JupyterLab (that did not work, returned to 3.2.1) and restarted the system.

I am also unable to open JupyterLab from CMD.exe (error is same as specified below)

JupyterLab was starting this morning, and started failing after I updated some modules from within Anaconda.

The error I get is:

C:\Users…\AppData\Local\Continuum\anaconda3\lib\site-packages\nbclassic\notebookapp.py:73: FutureWarning: The alias _() will be deprecated. Use _i18n() instead.
(“Don’t open the notebook in a browser after startup.”)
C:\Users…r\AppData\Local\Continuum\anaconda3\lib\site-packages\nbclassic\notebookapp.py:89: FutureWarning: The alias _() will be deprecated. Use _i18n() instead.
(“Allow the notebook to be run from root user.”)
C:\Users…\AppData\Local\Continuum\anaconda3\lib\site-packages\nbclassic\traits.py:20: FutureWarning: The alias _() will be deprecated. Use _i18n() instead.
help=(‘Deprecated: Use minified JS file or not, mainly use during dev to avoid JS recompilation’),
C:\Users…\AppData\Local\Continuum\anaconda3\lib\site-packages\nbclassic\traits.py:25: FutureWarning: The alias _() will be deprecated. Use _i18n() instead.
help=(“Supply extra arguments that will be passed to Jinja environment.”))
C:\Users…\AppData\Local\Continuum\anaconda3\lib\site-packages\nbclassic\traits.py:29: FutureWarning: The alias _() will be deprecated. Use _i18n() instead.
help=(“Extra variables to supply to jinja templates when rendering.”),
C:\Users…\AppData\Local\Continuum\anaconda3\lib\site-packages\nbclassic\traits.py:62: FutureWarning: The alias _() will be deprecated. Use _i18n() instead.
help=(""“Path to search for custom.js, css”"")
C:\Users…\AppData\Local\Continuum\anaconda3\lib\site-packages\nbclassic\traits.py:76: FutureWarning: The alias _() will be deprecated. Use _i18n() instead.
Can be used to override templates from notebook.templates.""")
C:\Users…\AppData\Local\Continuum\anaconda3\lib\site-packages\nbclassic\traits.py:85: FutureWarning: The alias _() will be deprecated. Use _i18n() instead.
help=(""“extra paths to look for Javascript notebook extensions”"")
C:\Users…\AppData\Local\Continuum\anaconda3\lib\site-packages\nbclassic\traits.py:130: FutureWarning: The alias _() will be deprecated. Use _i18n() instead.
help=(""“The MathJax.js configuration file that is to be used.”"")
C:\Users…\AppData\Local\Continuum\anaconda3\lib\site-packages\nbclassic\traits.py:143: FutureWarning: The alias _() will be deprecated. Use _i18n() instead.
help=((“Dict of Python modules to load as notebook server extensions.”
C:\Users…\AppData\Local\Continuum\anaconda3\lib\site-packages\nbclassic\notebookapp.py:124: FutureWarning: The alias _() will be deprecated. Use _i18n() instead.
This launches a Tornado based HTML Notebook Server that serves up an HTML5/Javascript Notebook client.""")
C:\Users…\AppData\Local\Continuum\anaconda3\lib\site-packages\nbclassic\notebookapp.py:143: FutureWarning: The alias _() will be deprecated. Use _i18n() instead.
help=(""“Path to search for custom.js, css”"")
C:\Users…\AppData\Local\Continuum\anaconda3\lib\site-packages\nbclassic\notebookapp.py:155: FutureWarning: The alias _() will be deprecated. Use _i18n() instead.
help=_(""“extra paths to look for Javascript notebook extensions”"")
[I 2022-02-11 13:11:09.820 ServerApp] jupyterlab | extension was successfully linked.
[W 2022-02-11 13:11:10.931 ServerApp] ‘ExtensionManager’ object has no attribute ‘_extensions’
Traceback (most recent call last):
File “C:\Users…\AppData\Local\Continuum\anaconda3\Scripts\jupyter-lab-script.py”, line 9, in
sys.exit(main())
File “C:\Users…\AppData\Local\Continuum\anaconda3\lib\site-packages\jupyter_server\extension\application.py”, line 567, in launch_instance
serverapp = cls.initialize_server(argv=args)
File “C:\Users…\AppData\Local\Continuum\anaconda3\lib\site-packages\jupyter_server\extension\application.py”, line 540, in initialize_server
find_extensions=find_extensions,
File “C:\Users…\AppData\Local\Continuum\anaconda3\lib\site-packages\traitlets\config\application.py”, line 88, in inner
return method(app, *args, **kwargs)
File “C:\Users…\AppData\Local\Continuum\anaconda3\lib\site-packages\jupyter_server\serverapp.py”, line 2341, in initialize
point = self.extension_manager.extension_points[starter_extension]
File “C:\Users…\AppData\Local\Continuum\anaconda3\lib\site-packages\jupyter_server\extension\manager.py”, line 303, in extension_points
for value in self.extensions.values()
File “C:\Users…\AppData\Local\Continuum\anaconda3\lib\site-packages\nbclassic\nbserver.py”, line 80, in extensions
nb = self._extensions.get(“nbclassic”)
AttributeError: ‘ExtensionManager’ object has no attribute ‘_extensions’

Ideas???

Thank you,

John Pflueger

krassowski · February 13, 2022, 4:36pm

Searching for AttributeError: ‘ExtensionManager’ object has no attribute ‘_extensions’ brings up:

github.com/jupyterlab/jupyterlab

'ExtensionManager' object has no attribute '_extensions' when starting JupyterLab

opened 10:36PM - 10 May 21 UTC

closed 09:03AM - 11 May 21 UTC

zhzhang2018

bug status:resolved-locked

## Description I recently upgraded my OS to Big Sur. As a result, Python 3.6 doesn't work anymore, and I believe I followed all the right procedures to install Python 3.9.5, followed by new installations of JupyterLab and all other packages I've been using. The error shows up when I try to run Jupyter Lab: ``` $ jupyter lab [I 2021-05-10 17:45:40.849 ServerApp] jupyterlab | extension was successfully linked. [W 2021-05-10 17:45:41.200 ServerApp] 'ExtensionManager' object has no attribute '_extensions' Traceback (most recent call last): File "/Library/Frameworks/Python.framework/Versions/3.9/bin/jupyter-lab", line 8, in <module> sys.exit(main()) File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/jupyter_server/extension/application.py", line 518, in launch_instance serverapp = cls.initialize_server(argv=args) File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/jupyter_server/extension/application.py", line 488, in initialize_server serverapp.initialize( File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/traitlets/config/application.py", line 87, in inner return method(app, *args, **kwargs) File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/jupyter_server/serverapp.py", line 1855, in initialize point = self.extension_manager.extension_points[starter_extension] File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/jupyter_server/extension/manager.py", line 290, in extension_points extensions = self.extensions File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/nbclassic/nbserver.py", line 80, in extensions nb = self._extensions.get("nbclassic") AttributeError: 'ExtensionManager' object has no attribute '_extensions' ``` For some reason, I wasn't able to find this exact error anywhere on Google. I might try changing `jupyter_notebook_config.json` later. ## Reproduce I guess it'll be hard to describe the exact steps to reproduce, because reinstalling Python and redirecting the terminal command to the right file took a lot of trials and errors for me. Here's a rough timeline: 1. Upgrade OS into Big Sur and find out that python 3.6 won't work anymore with an error message: dyld: Library not loaded: /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation Referenced from: /Library/Frameworks/Python.framework/Versions/3.6/Resources/Python.app/Contents/MacOS/Python Reason: image not found 2. Try to install newest package using Homebrew, which ended up being in `usr/local/bin` instead of `Library/Frameworks/...`, and then being confused as to why Jupyter is still using the corrupted 3.6; 3. Install the newest package from python.org, which installed Python 3.9 in `Library/Frameworks/...` successfully; 4. Modify the paths from `open ~/.bash_profile` to remove the old 3.6; 5. Install Jupyter, Jupyterlab, iPython etc., using the newly-installed pip3. Type `$ jupyter lab`, and this issue showed up.  ## What I tried 1. Tried to run `pip3 install nbclassic` again, but didn't work (nothing new was installed or reinstalled). 2. Tried to run `jupyter labextension list` as suggested by some answers that Google was able to find (but not relevant). The printed result: ``` JupyterLab v3.0.15 /Library/Frameworks/Python.framework/Versions/3.9/share/jupyter/labextensions @jupyter-widgets/jupyterlab-manager v3.0.0 enabled OK (python, jupyterlab_widgets) ``` 3. Tried running `jupyter lab build`. The first time it told me to install node.js (which I assume should've already been there. I was able to run Jupyter Lab without issues before.). The second time there's no error message, and I only got: ``` [LabBuildApp] JupyterLab 3.0.15 [LabBuildApp] Building in /Library/Frameworks/Python.framework/Versions/3.9/share/jupyter/lab [LabBuildApp] Building jupyterlab assets (production, minimized) ``` ## Expected behavior I expected it to work just like before, by opening a new browser window and showing me the file directory. In fact, running `python3 -m notebook` successfully launched a new browser window, albeit with some other errors regarding missing extensions (tensorboard; unrelated). ## Context - Operating System and version: Big Sur 11.3.1 - Browser and version: Firefox - JupyterLab version: 6.3.0 <details><summary>Troubleshoot Output</summary> <pre> $PATH: /Library/Frameworks/Python.framework/Versions/3.9/bin /opt/local/bin /opt/local/sbin /usr/local/bin /usr/bin /bin /usr/sbin /sbin /Library/TeX/texbin /usr/local/share/dotnet ~/.dotnet/tools /Library/Frameworks/Mono.framework/Versions/Current/Commands sys.path: /Library/Frameworks/Python.framework/Versions/3.9/bin /Library/Frameworks/Python.framework/Versions/3.9/lib/python39.zip /Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9 /Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/lib-dynload /Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages sys.executable: /Library/Frameworks/Python.framework/Versions/3.9/bin/python3.9 sys.version: 3.9.5 (v3.9.5:0a7dcbdb13, May 3 2021, 13:17:02) [Clang 6.0 (clang-600.0.57)] platform.platform(): macOS-10.16-x86_64-i386-64bit which -a jupyter: /Library/Frameworks/Python.framework/Versions/3.9/bin/jupyter pip list: Package Version ----------------------- ------------------- absl-py 0.12.0 anyio 3.0.1 appdirs 1.4.4 appnope 0.1.2 argon2-cffi 20.1.0 astunparse 1.6.3 async-generator 1.10 attrs 21.2.0 Babel 2.9.1 backcall 0.2.0 beautifulsoup4 4.9.3 bleach 3.3.0 cachetools 4.2.2 certifi 2020.12.5 cffi 1.14.5 chardet 4.0.0 cycler 0.10.0 decorator 4.4.2 defusedxml 0.7.1 distlib 0.3.1 entrypoints 0.3 filelock 3.0.12 flatbuffers 1.12 gast 0.4.0 google-auth 1.30.0 google-auth-oauthlib 0.4.4 google-pasta 0.2.0 grpcio 1.34.1 h5py 3.1.0 idna 2.10 ipykernel 5.5.4 ipython 7.23.1 ipython-genutils 0.2.0 ipywidgets 7.6.3 jedi 0.18.0 Jinja2 2.11.3 joblib 1.0.1 json5 0.9.5 jsonschema 3.2.0 jupyter 1.0.0 jupyter-client 6.1.12 jupyter-console 6.4.0 jupyter-core 4.7.1 jupyter-server 1.7.0 jupyterlab 3.0.15 jupyterlab-pygments 0.1.2 jupyterlab-server 2.5.1 jupyterlab-widgets 1.0.0 keras-nightly 2.5.0.dev2021032900 Keras-Preprocessing 1.1.2 kiwisolver 1.3.1 Markdown 3.3.4 MarkupSafe 1.1.1 matplotlib 3.4.2 matplotlib-inline 0.1.2 mistune 0.8.4 nbclassic 0.2.7 nbclient 0.5.3 nbconvert 6.0.7 nbformat 5.1.3 nest-asyncio 1.5.1 networkx 2.5.1 notebook 6.3.0 numpy 1.19.5 oauthlib 3.1.0 openai 0.6.3 opencv-python 4.5.2.52 opt-einsum 3.3.0 packaging 20.9 pandas 1.2.4 pandocfilters 1.4.3 parso 0.8.2 patsy 0.5.1 pexpect 4.8.0 pgmpy 0.1.14 pickleshare 0.7.5 Pillow 8.2.0 pip 21.1.1 prometheus-client 0.10.1 prompt-toolkit 3.0.18 protobuf 3.16.0 ptyprocess 0.7.0 pyasn1 0.4.8 pyasn1-modules 0.2.8 pycparser 2.20 Pygments 2.9.0 pyparsing 2.4.7 pyrsistent 0.17.3 python-dateutil 2.8.1 pytz 2021.1 pyzmq 22.0.3 qtconsole 5.1.0 QtPy 1.9.0 requests 2.25.1 requests-oauthlib 1.3.0 rsa 4.7.2 scikit-learn 0.24.2 scipy 1.6.3 seaborn 0.11.1 Send2Trash 1.5.0 setuptools 56.0.0 six 1.15.0 sniffio 1.2.0 soupsieve 2.2.1 statsmodels 0.12.2 tensorboard 2.5.0 tensorboard-data-server 0.6.1 tensorboard-plugin-wit 1.8.0 tensorflow 2.5.0rc3 tensorflow-estimator 2.5.0rc0 termcolor 1.1.0 terminado 0.9.4 testpath 0.4.4 threadpoolctl 2.1.0 torch 1.8.1 tornado 6.1 tqdm 4.60.0 traitlets 5.0.5 typing-extensions 3.7.4.3 urllib3 1.26.4 virtualenv 20.4.6 wcwidth 0.2.5 webencodings 0.5.1 websocket-client 0.59.0 Werkzeug 1.0.1 wheel 0.36.2 widgetsnbextension 3.5.1 wrapt 1.12.1 </pre> </details> <details><summary>Command Line Output</summary> <pre> [D 2021-05-10 18:29:33.770 ServerApp] Searching ['/Users/xxx/.jupyter', '/Library/Frameworks/Python.framework/Versions/3.9/etc/jupyter', '/usr/local/etc/jupyter', '/etc/jupyter'] for config files [D 2021-05-10 18:29:33.770 ServerApp] Looking for jupyter_config in /etc/jupyter [D 2021-05-10 18:29:33.771 ServerApp] Looking for jupyter_config in /usr/local/etc/jupyter [D 2021-05-10 18:29:33.771 ServerApp] Looking for jupyter_config in /Library/Frameworks/Python.framework/Versions/3.9/etc/jupyter [D 2021-05-10 18:29:33.771 ServerApp] Looking for jupyter_config in /Users/xxx/.jupyter [D 2021-05-10 18:29:33.771 ServerApp] Looking for jupyter_config in /Users/xxx/<root directory> [D 2021-05-10 18:29:33.772 ServerApp] Looking for jupyter_server_config in /etc/jupyter [D 2021-05-10 18:29:33.772 ServerApp] Looking for jupyter_server_config in /usr/local/etc/jupyter [D 2021-05-10 18:29:33.772 ServerApp] Looking for jupyter_server_config in /Library/Frameworks/Python.framework/Versions/3.9/etc/jupyter [D 2021-05-10 18:29:33.772 ServerApp] Looking for jupyter_server_config in /Users/xxx/.jupyter [D 2021-05-10 18:29:33.773 ServerApp] Looking for jupyter_server_config in /Users/<root directory> [D 2021-05-10 18:29:33.775 ServerApp] Paths used for configuration of jupyter_server_config: /etc/jupyter/jupyter_server_config.json [D 2021-05-10 18:29:33.775 ServerApp] Paths used for configuration of jupyter_server_config: /usr/local/etc/jupyter/jupyter_server_config.json [D 2021-05-10 18:29:33.775 ServerApp] Paths used for configuration of jupyter_server_config: /Library/Frameworks/Python.framework/Versions/3.9/etc/jupyter/jupyter_server_config.d/jupyterlab.json /Library/Frameworks/Python.framework/Versions/3.9/etc/jupyter/jupyter_server_config.d/nbclassic.json /Library/Frameworks/Python.framework/Versions/3.9/etc/jupyter/jupyter_server_config.json [D 2021-05-10 18:29:33.777 ServerApp] Paths used for configuration of jupyter_server_config: /Users/xxx/.jupyter/jupyter_server_config.json [D 2021-05-10 18:29:33.791 LabApp] Config changed: {'NotebookApp': {}, 'ServerApp': {'log_level': 'DEBUG', 'jpserver_extensions': <LazyConfigValue {'update': {'nbclassic': True}}>}, 'ExtensionApp': {'log_level': 'DEBUG'}} [I 2021-05-10 18:29:33.792 ServerApp] jupyterlab | extension was successfully linked. [D 2021-05-10 18:29:33.805 NotebookApp] Config changed: {'NotebookApp': {'nbserver_extensions': {'jlstaticserve': True, 'jupyter_tensorboard': True}}, 'ServerApp': {'log_level': 'DEBUG', 'jpserver_extensions': <LazyConfigValue value={'jupyterlab': True, 'nbclassic': True}>}, 'ExtensionApp': {'log_level': 'DEBUG'}} [D 2021-05-10 18:29:34.138 ServerApp] Paths used for configuration of jupyter_notebook_config: /Users/xxx/.jupyter/jupyter_notebook_config.json [D 2021-05-10 18:29:34.139 ServerApp] Paths used for configuration of jupyter_notebook_config: /etc/jupyter/jupyter_notebook_config.json [D 2021-05-10 18:29:34.140 ServerApp] Paths used for configuration of jupyter_notebook_config: /usr/local/etc/jupyter/jupyter_notebook_config.json [D 2021-05-10 18:29:34.140 ServerApp] Paths used for configuration of jupyter_notebook_config: /Library/Frameworks/Python.framework/Versions/3.9/etc/jupyter/jupyter_notebook_config.d/jupyterlab.json /Library/Frameworks/Python.framework/Versions/3.9/etc/jupyter/jupyter_notebook_config.json [D 2021-05-10 18:29:34.141 ServerApp] Paths used for configuration of jupyter_notebook_config: /Users/xxx/.jupyter/jupyter_notebook_config.json [W 2021-05-10 18:29:34.141 ServerApp] 'ExtensionManager' object has no attribute '_extensions' Traceback (most recent call last): File "/Library/Frameworks/Python.framework/Versions/3.9/bin/jupyter-lab", line 8, in <module> sys.exit(main()) File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/jupyter_server/extension/application.py", line 518, in launch_instance serverapp = cls.initialize_server(argv=args) File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/jupyter_server/extension/application.py", line 488, in initialize_server serverapp.initialize( File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/traitlets/config/application.py", line 87, in inner return method(app, *args, **kwargs) File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/jupyter_server/serverapp.py", line 1855, in initialize point = self.extension_manager.extension_points[starter_extension] File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/jupyter_server/extension/manager.py", line 290, in extension_points extensions = self.extensions File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/nbclassic/nbserver.py", line 80, in extensions nb = self._extensions.get("nbclassic") AttributeError: 'ExtensionManager' object has no attribute '_extensions' </pre> </details> <details><summary>Browser Output</summary> <pre> (None) </pre> </details>

Which explains that you need to upgrade nbclassic. Since you are running conda, you could try with:

conda install "nbclassic>=0.2.8" -c conda-forge

If you are not using conda-forge channel, leave out the -c conda-forge part.

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