Jupyter Server breaks with extensions that depend on traitlets 4

[vwbusguy]

Description

Traitlets v4 support was removed in #661. Unfortunately, the current code does not gracefully handle the existence of traitlets 4 and the server fails on startup. This can happen if extensions that depend on it are installed, such as nbgrader, which does not support traitlets v5.

Reproduce

1. From the jupyter base notebook container
2. Install nbgrader with conda
3. Enable the notebook/server extension
4. Attempt to start jupyter server

Attempted to add nbgrader to class lab container image from current Jupyter notebook base.

nbgrader was successfully installed and enabled without error. From here, I expected Jupyter to start as it normally does. If nothing else, the error should be handled more gracefully and preferably caught earlier on during enabling of the incompatible extension.

Context

• Operating System and version: Ubuntu - jupyter/base-notebook:notebook-6.4.8 image
• Browser and version: Never got far enough to talk to a browser
• Jupyter Server version: jupyter/base-notebook:notebook-6.4.8
• Relevant Python deps after installing Jupyter nbgrader:

Requirement already satisfied: traitlets in /opt/conda/lib/python3.9/site-packages (4.3.3)
Requirement already satisfied: six in /opt/conda/lib/python3.9/site-packages (from traitlets) (1.16.0)
Requirement already satisfied: ipython-genutils in /opt/conda/lib/python3.9/site-packages (from traitlets) (0.2.0)
Requirement already satisfied: decorator in /opt/conda/lib/python3.9/site-packages (from traitlets) (5.1.1)

Troubleshoot Output

CondaEnvException: Unable to determine environment
Please re-run this command with one of the following options:

• Provide an environment name via --name or -n
• Re-run this command inside an activated conda environment.

$PATH: /opt/conda/bin /usr/local/sbin /usr/local/bin /usr/sbin /usr/bin /sbin /bin

sys.path: /opt/conda/bin /opt/conda/lib/python39.zip /opt/conda/lib/python3.9 /opt/conda/lib/python3.9/lib-dynload /opt/conda/lib/python3.9/site-packages

sys.executable: /opt/conda/bin/python

sys.version: 3.9.10 | packaged by conda-forge | (main, Feb 1 2022, 21:24:11) [GCC 9.4.0]

platform.platform(): Linux-4.18.0-348.12.2.el8_5.x86_64-x86_64-with-glibc2.31

which -a jupyter: /opt/conda/bin/jupyter

pip list: Package Version ----------------------------- --------- alembic 1.7.6 anyio 3.5.0 argon2-cffi 21.3.0 argon2-cffi-bindings 21.2.0 asdf 2.7.2 astropy 5.0.1 asttokens 2.0.5 async-generator 1.10 attrs 21.4.0 Babel 2.9.1 backcall 0.2.0 backports.functools-lru-cache 1.6.4 black 22.1.0 bleach 4.1.0 blinker 1.4 Bottleneck 1.3.4 brotlipy 0.7.0 certifi 2021.10.8 certipy 0.1.3 cffi 1.15.0 charset-normalizer 2.0.12 click 8.0.4 cloudpickle 2.0.0 colorama 0.4.4 conda 4.11.0 conda-package-handling 1.7.3 coverage 6.3.2 cryptography 36.0.1 cycler 0.11.0 cytoolz 0.11.2 dask 2022.2.1 dataclasses 0.8 debugpy 1.5.1 decorator 5.1.1 defusedxml 0.7.1 entrypoints 0.4 executing 0.8.3 flit_core 3.7.1 fonttools 4.29.1 fsspec 2022.2.0 greenlet 1.1.2 gwcs 0.17.1 hypothesis 6.39.3 idna 3.3 imagecodecs 2022.2.22 imageio 2.16.1 importlib-metadata 4.11.2 importlib-resources 5.4.0 iniconfig 1.1.1 ipykernel 6.4.2 ipython 7.32.0 ipython-genutils 0.2.0 ipywidgets 7.6.5 jedi 0.18.1 Jinja2 3.0.3 joblib 1.1.0 json5 0.9.5 jsonschema 4.4.0 jupyter 1.0.0 jupyter-client 7.1.2 jupyter-console 6.4.3 jupyter-core 4.9.2 jupyter-server 1.13.2 jupyter-telemetry 0.1.0 jupyterhub 2.1.1 jupyterlab 3.2.9 jupyterlab-pygments 0.1.2 jupyterlab-server 2.10.3 jupyterlab-widgets 1.0.2 kiwisolver 1.3.2 libmambapy 0.22.1 locket 0.2.0 Mako 1.1.6 mamba 0.22.1 MarkupSafe 2.1.0 matplotlib 3.5.1 matplotlib-inline 0.1.3 mistune 0.8.4 munkres 1.1.4 mypy-extensions 0.4.3 nbclassic 0.3.5 nbclient 0.5.11 nbconvert 5.6.1 nbformat 5.1.3 nbgitpuller 1.0.2 nbgrader 0.6.2 nest-asyncio 1.5.4 networkx 2.7.1 notebook 6.4.8 numpy 1.22.2 oauthlib 3.2.0 packaging 21.3 pamela 1.0.0 pandas 1.4.1 pandocfilters 1.5.0 parso 0.8.3 partd 1.2.0 pathspec 0.9.0 pexpect 4.8.0 photutils 1.3.0 pickleshare 0.7.5 Pillow 9.0.1 pip 22.0.3 platformdirs 2.5.1 pluggy 1.0.0 prometheus-client 0.13.1 prompt-toolkit 3.0.27 psutil 5.9.0 ptyprocess 0.7.0 pure-eval 0.2.2 py 1.11.0 pycosat 0.6.3 pycparser 2.21 pycurl 7.44.1 pyerfa 2.0.0.1 Pygments 2.11.2 PyJWT 2.3.0 pyOpenSSL 22.0.0 pyparsing 3.0.7 PyQt5 5.12.3 PyQt5_sip 4.19.18 PyQtChart 5.12 PyQtWebEngine 5.12.1 pyrsistent 0.18.1 PySocks 1.7.1 pytest 7.0.1 pytest-arraydiff 0.3 pytest-astropy 0.9.0 pytest-astropy-header 0.1.2 pytest-cov 3.0.0 pytest-doctestplus 0.12.0 pytest-filter-subpackage 0.1.1 pytest-mock 3.7.0 pytest-openfiles 0.5.0 pytest-remotedata 0.3.3 python-dateutil 2.8.2 python-json-logger 2.0.1 pytz 2021.3 PyWavelets 1.2.0 PyYAML 6.0 pyzmq 22.3.0 qtconsole 5.2.2 QtPy 2.0.1 rapidfuzz 1.9.1 requests 2.27.1 ruamel.yaml 0.17.21 ruamel.yaml.clib 0.2.6 ruamel-yaml-conda 0.15.80 scikit-image 0.19.2 scikit-learn 1.0.2 scipy 1.8.0 semantic-version 2.9.0 Send2Trash 1.8.0 setuptools 60.9.3 six 1.16.0 sniffio 1.2.0 sortedcontainers 2.4.0 SQLAlchemy 1.3.23 stack-data 0.2.0 terminado 0.13.1 testpath 0.6.0 threadpoolctl 3.1.0 tifffile 2022.2.9 toml 0.10.2 tomli 2.0.1 toolz 0.11.2 tornado 6.1 tqdm 4.63.0 traitlets 5.0.5 typed-ast 1.5.2 typing_extensions 4.1.1 unicodedata2 14.0.0 urllib3 1.26.8 wcwidth 0.2.5 webencodings 0.5.1 websocket-client 1.3.1 wheel 0.37.1 widgetsnbextension 3.5.2 zipp 3.7.0

conda list: # packages in environment at /opt/conda: # # Name Version Build Channel _libgcc_mutex 0.1 conda_forge conda-forge _openmp_mutex 4.5 1_gnu conda-forge alembic 1.7.6 pyhd8ed1ab_0 conda-forge alsa-lib 1.2.3 h516909a_0 conda-forge anyio 3.5.0 py39hf3d152e_0 conda-forge aom 3.3.0 h27087fc_1 conda-forge argon2-cffi 21.3.0 pyhd8ed1ab_0 conda-forge argon2-cffi-bindings 21.2.0 py39h3811e60_1 conda-forge asdf 2.7.2 pyhd8ed1ab_0 conda-forge astropy 5.0.1 py39hce5d2b2_0 conda-forge asttokens 2.0.5 pyhd8ed1ab_0 conda-forge async_generator 1.10 py_0 conda-forge attrs 21.4.0 pyhd8ed1ab_0 conda-forge babel 2.9.1 pyh44b312d_0 conda-forge backcall 0.2.0 pyh9f0ad1d_0 conda-forge backports 1.0 py_2 conda-forge backports.functools_lru_cache 1.6.4 pyhd8ed1ab_0 conda-forge black 22.1.0 pyhd8ed1ab_0 conda-forge bleach 4.1.0 pyhd8ed1ab_0 conda-forge blinker 1.4 py_1 conda-forge blosc 1.21.0 h9c3ff4c_0 conda-forge bottleneck 1.3.4 py39hd257fcd_0 conda-forge brotli 1.0.9 h7f98852_6 conda-forge brotli-bin 1.0.9 h7f98852_6 conda-forge brotlipy 0.7.0 py39h3811e60_1003 conda-forge brunsli 0.1 h9c3ff4c_0 conda-forge bzip2 1.0.8 h7f98852_4 conda-forge c-ares 1.18.1 h7f98852_0 conda-forge c-blosc2 2.0.4 h5f21a17_1 conda-forge ca-certificates 2021.10.8 ha878542_0 conda-forge certifi 2021.10.8 py39hf3d152e_1 conda-forge certipy 0.1.3 py_0 conda-forge cffi 1.15.0 py39h4bc2ebd_0 conda-forge cfitsio 4.0.0 h9a35b8e_0 conda-forge charls 2.3.4 h9c3ff4c_0 conda-forge charset-normalizer 2.0.12 pyhd8ed1ab_0 conda-forge click 8.0.4 py39hf3d152e_0 conda-forge cloudpickle 2.0.0 pyhd8ed1ab_0 conda-forge colorama 0.4.4 pyh9f0ad1d_0 conda-forge conda 4.11.0 py39hf3d152e_0 conda-forge conda-package-handling 1.7.3 py39h3811e60_1 conda-forge configurable-http-proxy 4.5.1 node17_h7e777a6_1 conda-forge coverage 6.3.2 py39hb9d737c_1 conda-forge cryptography 36.0.1 py39h95dcef6_0 conda-forge cycler 0.11.0 pyhd8ed1ab_0 conda-forge cytoolz 0.11.2 py39h3811e60_1 conda-forge dask-core 2022.2.1 pyhd8ed1ab_0 conda-forge dataclasses 0.8 pyhc8e2a94_3 conda-forge dbus 1.13.6 h5008d03_3 conda-forge debugpy 1.5.1 py39he80948d_0 conda-forge decorator 5.1.1 pyhd8ed1ab_0 conda-forge defusedxml 0.7.1 pyhd8ed1ab_0 conda-forge entrypoints 0.4 pyhd8ed1ab_0 conda-forge executing 0.8.3 pyhd8ed1ab_0 conda-forge expat 2.4.6 h27087fc_0 conda-forge flit-core 3.7.1 pyhd8ed1ab_0 conda-forge font-ttf-dejavu-sans-mono 2.37 hab24e00_0 conda-forge font-ttf-inconsolata 3.000 h77eed37_0 conda-forge font-ttf-source-code-pro 2.038 h77eed37_0 conda-forge font-ttf-ubuntu 0.83 hab24e00_0 conda-forge fontconfig 2.13.96 ha180cfb_0 conda-forge fonts-conda-ecosystem 1 0 conda-forge fonts-conda-forge 1 0 conda-forge fonttools 4.29.1 py39h3811e60_0 conda-forge freetype 2.10.4 h0708190_1 conda-forge fsspec 2022.2.0 pyhd8ed1ab_0 conda-forge gettext 0.19.8.1 h73d1719_1008 conda-forge giflib 5.2.1 h36c2ea0_2 conda-forge greenlet 1.1.2 py39he80948d_1 conda-forge gst-plugins-base 1.18.5 hf529b03_3 conda-forge gstreamer 1.18.5 h9f60fe5_3 conda-forge gwcs 0.17.1 pyhd8ed1ab_0 conda-forge hypothesis 6.39.3 pyhd8ed1ab_0 conda-forge icu 69.1 h9c3ff4c_0 conda-forge idna 3.3 pyhd8ed1ab_0 conda-forge imagecodecs 2022.2.22 py39hf577088_0 conda-forge imageio 2.16.1 pyhcf75d05_0 conda-forge importlib-metadata 4.11.2 py39hf3d152e_0 conda-forge importlib_resources 5.4.0 pyhd8ed1ab_0 conda-forge iniconfig 1.1.1 pyh9f0ad1d_0 conda-forge ipykernel 6.4.2 py39hef51801_0 conda-forge ipython 7.32.0 py39hf3d152e_0 conda-forge ipython_genutils 0.2.0 py_1 conda-forge ipywidgets 7.6.5 pyhd8ed1ab_0 conda-forge jbig 2.1 h7f98852_2003 conda-forge jedi 0.18.1 py39hf3d152e_0 conda-forge jinja2 3.0.3 pyhd8ed1ab_0 conda-forge joblib 1.1.0 pyhd8ed1ab_0 conda-forge jpeg 9e h7f98852_0 conda-forge json5 0.9.5 pyh9f0ad1d_0 conda-forge jsonschema 4.4.0 pyhd8ed1ab_0 conda-forge jupyter 1.0.0 py39hf3d152e_7 conda-forge jupyter_client 7.1.2 pyhd8ed1ab_0 conda-forge jupyter_console 6.4.3 pyhd8ed1ab_0 conda-forge jupyter_core 4.9.2 py39hf3d152e_0 conda-forge jupyter_server 1.13.2 pyhd8ed1ab_0 conda-forge jupyter_telemetry 0.1.0 pyhd8ed1ab_1 conda-forge jupyterhub 2.1.1 hd8ed1ab_0 conda-forge jupyterhub-base 2.1.1 pyhd8ed1ab_0 conda-forge jupyterlab 3.2.9 pyhd8ed1ab_0 conda-forge jupyterlab_pygments 0.1.2 pyh9f0ad1d_0 conda-forge jupyterlab_server 2.10.3 pyhd8ed1ab_0 conda-forge jupyterlab_widgets 1.0.2 pyhd8ed1ab_0 conda-forge jxrlib 1.1 h7f98852_2 conda-forge keyutils 1.6.1 h166bdaf_0 conda-forge kiwisolver 1.3.2 py39h1a9c180_1 conda-forge krb5 1.19.2 h3790be6_4 conda-forge lcms2 2.12 hddcbb42_0 conda-forge ld_impl_linux-64 2.36.1 hea4e1c9_2 conda-forge lerc 3.0 h9c3ff4c_0 conda-forge libaec 1.0.6 h9c3ff4c_0 conda-forge libarchive 3.5.2 hccf745f_1 conda-forge libavif 0.9.3 h166bdaf_1 conda-forge libblas 3.9.0 13_linux64_openblas conda-forge libbrotlicommon 1.0.9 h7f98852_6 conda-forge libbrotlidec 1.0.9 h7f98852_6 conda-forge libbrotlienc 1.0.9 h7f98852_6 conda-forge libcblas 3.9.0 13_linux64_openblas conda-forge libclang 13.0.1 default_hc23dcda_0 conda-forge libcurl 7.81.0 h2574ce0_0 conda-forge libdeflate 1.10 h7f98852_0 conda-forge libedit 3.1.20191231 he28a2e2_2 conda-forge libev 4.33 h516909a_1 conda-forge libevent 2.1.10 h9b69904_4 conda-forge libffi 3.4.2 h7f98852_5 conda-forge libgcc-ng 11.2.0 h1d223b6_12 conda-forge libgfortran-ng 11.2.0 h69a702a_13 conda-forge libgfortran5 11.2.0 h5c6108e_13 conda-forge libglib 2.70.2 h174f98d_4 conda-forge libgomp 11.2.0 h1d223b6_12 conda-forge libiconv 1.16 h516909a_0 conda-forge liblapack 3.9.0 13_linux64_openblas conda-forge libllvm13 13.0.1 hf817b99_2 conda-forge libmamba 0.22.1 h9c208ef_0 conda-forge libmambapy 0.22.1 py39h3216e65_0 conda-forge libnghttp2 1.47.0 h727a467_0 conda-forge libnsl 2.0.0 h7f98852_0 conda-forge libogg 1.3.4 h7f98852_1 conda-forge libopenblas 0.3.18 pthreads_h8fe5266_0 conda-forge libopus 1.3.1 h7f98852_1 conda-forge libpng 1.6.37 h21135ba_2 conda-forge libpq 14.2 hd57d9b9_0 conda-forge libsodium 1.0.18 h36c2ea0_1 conda-forge libsolv 0.7.19 h780b84a_5 conda-forge libssh2 1.10.0 ha56f1ee_2 conda-forge libstdcxx-ng 11.2.0 he4da1e4_12 conda-forge libtiff 4.3.0 h542a066_3 conda-forge libuuid 2.32.1 h7f98852_1000 conda-forge libuv 1.43.0 h7f98852_0 conda-forge libvorbis 1.3.7 h9c3ff4c_0 conda-forge libwebp 1.2.2 h3452ae3_0 conda-forge libwebp-base 1.2.2 h7f98852_1 conda-forge libxcb 1.13 h7f98852_1004 conda-forge libxkbcommon 1.0.3 he3ba5ed_0 conda-forge libxml2 2.9.12 h885dcf4_1 conda-forge libzlib 1.2.11 h36c2ea0_1013 conda-forge libzopfli 1.0.3 h9c3ff4c_0 conda-forge locket 0.2.0 py_2 conda-forge lz4-c 1.9.3 h9c3ff4c_1 conda-forge lzo 2.10 h516909a_1000 conda-forge mako 1.1.6 pyhd8ed1ab_0 conda-forge mamba 0.22.1 py39hfa8f2c8_0 conda-forge markupsafe 2.1.0 py39hb9d737c_0 conda-forge matplotlib 3.5.1 py39hf3d152e_0 conda-forge matplotlib-base 3.5.1 py39h2fa2bec_0 conda-forge matplotlib-inline 0.1.3 pyhd8ed1ab_0 conda-forge mistune 0.8.4 py39h3811e60_1005 conda-forge munkres 1.1.4 pyh9f0ad1d_0 conda-forge mypy_extensions 0.4.3 py39hf3d152e_4 conda-forge mysql-common 8.0.28 ha770c72_0 conda-forge mysql-libs 8.0.28 hfa10184_0 conda-forge nbclassic 0.3.5 pyhd8ed1ab_0 conda-forge nbclient 0.5.11 pyhd8ed1ab_0 conda-forge nbconvert 5.6.1 pyhd8ed1ab_2 conda-forge nbformat 5.1.3 pyhd8ed1ab_0 conda-forge nbgitpuller 1.0.2 pypi_0 pypi nbgrader 0.6.2 py39hf3d152e_1 conda-forge ncurses 6.3 h9c3ff4c_0 conda-forge nest-asyncio 1.5.4 pyhd8ed1ab_0 conda-forge networkx 2.7.1 pyhd8ed1ab_0 conda-forge nodejs 17.4.0 h8ca31f7_0 conda-forge notebook 6.4.8 pyha770c72_0 conda-forge nspr 4.32 h9c3ff4c_1 conda-forge nss 3.74 hb5efdd6_0 conda-forge numpy 1.22.2 py39h91f2184_0 conda-forge oauthlib 3.2.0 pyhd8ed1ab_0 conda-forge openjpeg 2.4.0 hb52868f_1 conda-forge openssl 1.1.1l h7f98852_0 conda-forge packaging 21.3 pyhd8ed1ab_0 conda-forge pamela 1.0.0 py_0 conda-forge pandas 1.4.1 py39hde0f152_0 conda-forge pandoc 2.17.1.1 ha770c72_0 conda-forge pandocfilters 1.5.0 pyhd8ed1ab_0 conda-forge parso 0.8.3 pyhd8ed1ab_0 conda-forge partd 1.2.0 pyhd8ed1ab_0 conda-forge pathspec 0.9.0 pyhd8ed1ab_0 conda-forge pcre 8.45 h9c3ff4c_0 conda-forge pexpect 4.8.0 pyh9f0ad1d_2 conda-forge photutils 1.3.0 py39hce5d2b2_1 conda-forge pickleshare 0.7.5 py_1003 conda-forge pillow 9.0.1 py39hae2aec6_2 conda-forge pip 22.0.3 pyhd8ed1ab_0 conda-forge platformdirs 2.5.1 pyhd8ed1ab_0 conda-forge pluggy 1.0.0 py39hf3d152e_2 conda-forge prometheus_client 0.13.1 pyhd8ed1ab_0 conda-forge prompt-toolkit 3.0.27 pyha770c72_0 conda-forge prompt_toolkit 3.0.27 hd8ed1ab_0 conda-forge psutil 5.9.0 py39h3811e60_0 conda-forge pthread-stubs 0.4 h36c2ea0_1001 conda-forge ptyprocess 0.7.0 pyhd3deb0d_0 conda-forge pure_eval 0.2.2 pyhd8ed1ab_0 conda-forge py 1.11.0 pyh6c4a22f_0 conda-forge pybind11-abi 4 hd8ed1ab_3 conda-forge pycosat 0.6.3 py39h3811e60_1009 conda-forge pycparser 2.21 pyhd8ed1ab_0 conda-forge pycurl 7.44.1 py39h72e3413_1 conda-forge pyerfa 2.0.0.1 py39hce5d2b2_1 conda-forge pygments 2.11.2 pyhd8ed1ab_0 conda-forge pyjwt 2.3.0 pyhd8ed1ab_1 conda-forge pyopenssl 22.0.0 pyhd8ed1ab_0 conda-forge pyparsing 3.0.7 pyhd8ed1ab_0 conda-forge pyqt 5.12.3 py39hf3d152e_8 conda-forge pyqt-impl 5.12.3 py39hde8b62d_8 conda-forge pyqt5-sip 4.19.18 py39he80948d_8 conda-forge pyqtchart 5.12 py39h0fcd23e_8 conda-forge pyqtwebengine 5.12.1 py39h0fcd23e_8 conda-forge pyrsistent 0.18.1 py39h3811e60_0 conda-forge pysocks 1.7.1 py39hf3d152e_4 conda-forge pytest 7.0.1 py39hf3d152e_0 conda-forge pytest-arraydiff 0.3 py_0 conda-forge pytest-astropy 0.9.0 pyhd8ed1ab_0 conda-forge pytest-astropy-header 0.1.2 py_0 conda-forge pytest-cov 3.0.0 pyhd8ed1ab_0 conda-forge pytest-doctestplus 0.12.0 pyhd8ed1ab_0 conda-forge pytest-filter-subpackage 0.1.1 py_0 conda-forge pytest-mock 3.7.0 pyhd8ed1ab_0 conda-forge pytest-openfiles 0.5.0 py_0 conda-forge pytest-remotedata 0.3.3 pyhd8ed1ab_0 conda-forge python 3.9.10 h85951f9_2_cpython conda-forge python-dateutil 2.8.2 pyhd8ed1ab_0 conda-forge python-json-logger 2.0.1 pyh9f0ad1d_0 conda-forge python_abi 3.9 2_cp39 conda-forge pytz 2021.3 pyhd8ed1ab_0 conda-forge pywavelets 1.2.0 py39hce5d2b2_1 conda-forge pyyaml 6.0 py39h3811e60_3 conda-forge pyzmq 22.3.0 py39h37b5a0c_1 conda-forge qt 5.12.9 ha98a1a1_5 conda-forge qtconsole 5.2.2 pyhd8ed1ab_1 conda-forge qtconsole-base 5.2.2 pyhd8ed1ab_1 conda-forge qtpy 2.0.1 pyhd8ed1ab_0 conda-forge rapidfuzz 1.9.1 py39hde0f152_0 conda-forge readline 8.1 h46c0cb4_0 conda-forge reproc 14.2.3 h7f98852_0 conda-forge reproc-cpp 14.2.3 h9c3ff4c_0 conda-forge requests 2.27.1 pyhd8ed1ab_0 conda-forge ruamel.yaml 0.17.21 py39h3811e60_0 conda-forge ruamel.yaml.clib 0.2.6 py39h3811e60_0 conda-forge ruamel_yaml 0.15.80 py39h3811e60_1006 conda-forge scikit-image 0.19.2 py39hde0f152_0 conda-forge scikit-learn 1.0.2 py39h4dfa638_0 conda-forge scipy 1.8.0 py39hee8e79c_1 conda-forge semantic_version 2.9.0 pyhd8ed1ab_0 conda-forge send2trash 1.8.0 pyhd8ed1ab_0 conda-forge setuptools 60.9.3 py39hf3d152e_0 conda-forge six 1.16.0 pyh6c4a22f_0 conda-forge snappy 1.1.8 he1b5a44_3 conda-forge sniffio 1.2.0 py39hf3d152e_2 conda-forge sortedcontainers 2.4.0 pyhd8ed1ab_0 conda-forge sqlalchemy 1.3.23 py39h3811e60_0 conda-forge sqlite 3.37.0 h9cd32fc_0 conda-forge stack_data 0.2.0 pyhd8ed1ab_0 conda-forge terminado 0.13.1 py39hf3d152e_0 conda-forge testpath 0.6.0 pyhd8ed1ab_0 conda-forge threadpoolctl 3.1.0 pyh8a188c0_0 conda-forge tifffile 2022.2.9 pyhd8ed1ab_0 conda-forge tk 8.6.12 h27826a3_0 conda-forge toml 0.10.2 pyhd8ed1ab_0 conda-forge tomli 2.0.1 pyhd8ed1ab_0 conda-forge toolz 0.11.2 pyhd8ed1ab_0 conda-forge tornado 6.1 py39h3811e60_2 conda-forge tqdm 4.63.0 pyhd8ed1ab_0 conda-forge traitlets 5.0.5 pypi_0 pypi typed-ast 1.5.2 py39h3811e60_0 conda-forge typing_extensions 4.1.1 pyha770c72_0 conda-forge tzdata 2021e he74cb21_0 conda-forge unicodedata2 14.0.0 py39h3811e60_0 conda-forge urllib3 1.26.8 pyhd8ed1ab_1 conda-forge wcwidth 0.2.5 pyh9f0ad1d_2 conda-forge webencodings 0.5.1 py_1 conda-forge websocket-client 1.3.1 pyhd8ed1ab_0 conda-forge wheel 0.37.1 pyhd8ed1ab_0 conda-forge widgetsnbextension 3.5.2 py39hf3d152e_1 conda-forge xorg-libxau 1.0.9 h7f98852_0 conda-forge xorg-libxdmcp 1.1.3 h7f98852_0 conda-forge xz 5.2.5 h516909a_1 conda-forge yaml 0.2.5 h7f98852_2 conda-forge yaml-cpp 0.6.3 he1b5a44_4 conda-forge zeromq 4.3.4 h9c3ff4c_1 conda-forge zfp 0.5.5 h9c3ff4c_8 conda-forge zipp 3.7.0 pyhd8ed1ab_1 conda-forge zlib 1.2.11 h36c2ea0_1013 conda-forge zstd 1.5.2 ha95c52a_0 conda-forge

Command Line Output

Jupyter never starts.  Here's the trace:
Traceback (most recent call last):
  File "/opt/conda/bin/jupyter-lab", line 6, in 
    from jupyterlab.labapp import main
  File "/opt/conda/lib/python3.9/site-packages/jupyterlab/labapp.py", line 15, in 
    from jupyter_server.serverapp import flags
  File "/opt/conda/lib/python3.9/site-packages/jupyter_server/serverapp.py", line 83, in 
    from jupyter_server.services.sessions.sessionmanager import SessionManager
  File "/opt/conda/lib/python3.9/site-packages/jupyter_server/services/sessions/sessionmanager.py", line 22, in 
    from jupyter_server.traittypes import InstanceFromClasses
  File "/opt/conda/lib/python3.9/site-packages/jupyter_server/traittypes.py", line 7, in 
    from traitlets.utils.descriptions import describe
ModuleNotFoundError: No module named 'traitlets.utils.descriptions'

Browser Output

n/a

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[davidbrochart]

Thanks for reporting @vwbusguy. Indeed it seems that traitlets>=5 was required from v1.13.3, and you have v1.13.2. Upgrading should fix it, but you won't be able to install nbgrader.

[davidbrochart]

I don't have your exact environment, but I managed to install jupyter_server=1.13.2 and nbgrader with conda, and jupyter notebook starts without error.

[vwbusguy]

I'm using the Jupyter docker image: jupyter/base-notebook:notebook-6.4.8 .

Make sure the extension is also enabled:

jupyter nbextension install --sys-prefix --py nbgrader --overwrite
jupyter nbextension enable --sys-prefix --py nbgrader
jupyter serverextension enable --sys-prefix --py nbgrader

[blink1073]

This is coming from the conda-forge recipe being out of sync with the dependencies. I'm working on making a fix now.

[blink1073]

I merged the fix, it will take a while for the files to get to anaconda.org. https://github.com/conda-forge/nbgrader-feedstock/pull/48

[vwbusguy]

It looks like hide-code is another one I found today that triggers this, as well: https://github.com/kirbs-/hide_code/issues/98 . In that case, it was installed through pip and not conda-forge, FWIW.

[blink1073]

Closing as fixed, since kirbs-/hide_code/issues/98 is closed as well.