Browser console error: "jupyter.extensions.jupyter-leaflet failed to activate"

I’m configuring a JupyterLab (1.2.5) Docker environment, and I’m having a hard time getting ipyleaflet (0.12.3) to work consistently. When I create a simplified conda environment on my laptop with just JupyterLab, @jupyter-widgets/jupyterlab-manager and jupyter-leaflet, things work fine, but when I add in other libraries and plugins and deploy via a Docker image, ipyleaflet stops displaying maps, usually stuck on “Loading widget…” or “Error displaying widget: model not found” showing up in the notebook cell output, and the following in the browser (Chrome) console:

jupyter.extensions.jupyter-leaflet failed to activate

Deprecated include of L.Mixin.Events: this property will be removed in future releases, please inherit from L.Evented instead. Error
    at A (http://localhost:8888/static/lab/vendors~main.8429b74936d96d40265a.js:1:418775)
    at Function.D.extend (http://localhost:8888/static/lab/vendors~main.8429b74936d96d40265a.js:1:417777)
    at Object.OTXi (http://localhost:8888/static/lab/vendors~main.8429b74936d96d40265a.js:1:2116586)
    at n (http://localhost:8888/static/lab/main.54def8d69479e21e7b9a.js:1:875)
    at Object.mGYY (http://localhost:8888/static/lab/vendors~main.8429b74936d96d40265a.js:1:3855130)
    at n (http://localhost:8888/static/lab/main.54def8d69479e21e7b9a.js:1:875)
    at Module.MIrW (http://localhost:8888/static/lab/vendors~main.8429b74936d96d40265a.js:1:1972447)
    at n (http://localhost:8888/static/lab/main.54def8d69479e21e7b9a.js:1:875)
    at Object.O3wJ (http://localhost:8888/static/lab/vendors~main.8429b74936d96d40265a.js:1:2106302)
    at n (http://localhost:8888/static/lab/main.54def8d69479e21e7b9a.js:1:875)
A @ leaflet-src.js:400

...

index.js:267 Plugin 'jupyter.extensions.jupyter-leaflet' failed to activate.

...
Error: No provider for: jupyter.extensions.jupyterWidgetRegistry.
    at f.e.resolveRequiredService (index.js:182)
    at index.js:140
    at Array.map (<anonymous>)
    at f.e.activatePlugin (index.js:140)
    at index.js:266
    at Array.map (<anonymous>)
    at f.e.start (index.js:265)
    at a (index.out.js:1553)

...
Module jupyter-leaflet, semver range ^0.12.3 is not registered as a widget module
    at k.loadClass (manager.js:305

(Note: other ipywidget components (buttons, sliders, etc.) work fine.)

To make matters more frustrating, if I force reinstall @jupyter-widgets/jupyterlab-manager and jupyter-leaflet from the JupyterLab terminal, hard reset the browser, and rerun the cells, sometimes the maps will show up. But not every time. 😕

I’m assuming that there’s a version conflict with another library causing all this, but after a week of chopping the environment up I’m still no further along, and running out of ideas.

Any tips on additional things to try would be appreciated. Maybe a pointer to what role jupyter.extensions.jupyterWidgetRegistry plays and why it wouldn’t be found by the notebook plugin.

Jupyter Conda Environment

$ conda env export
name: base
channels:
  - conda-forge
  - defaults
dependencies:
  - _libgcc_mutex=0.1=conda_forge
  - _openmp_mutex=4.5=0_gnu
  - alembic=1.4.2=pyh9f0ad1d_0
  - async_generator=1.10=py_0
  - attrs=19.3.0=py_0
  - backcall=0.1.0=py_0
  - bleach=3.1.4=pyh9f0ad1d_0
  - blinker=1.4=py_1
  - branca=0.3.1=py_0
  - ca-certificates=2019.11.28=hecc5488_0
  - certifi=2019.11.28=py37hc8dfbb8_1
  - certipy=0.1.3=py_0
  - cffi=1.14.0=py37hd463f26_0
  - chardet=3.0.4=py37hc8dfbb8_1006
  - conda=4.8.3=py37hc8dfbb8_1
  - conda-package-handling=1.6.0=py37h8f50634_2
  - configurable-http-proxy=4.2.1=node13_he01fd0c_0
  - cryptography=2.8=py37hb09aad4_2
  - decorator=4.4.2=py_0
  - defusedxml=0.6.0=py_0
  - entrypoints=0.3=py37hc8dfbb8_1001
  - icu=64.2=he1b5a44_1
  - idna=2.9=py_1
  - importlib-metadata=1.6.0=py37hc8dfbb8_0
  - importlib_metadata=1.6.0=0
  - ipykernel=5.2.0=py37h43977f1_1
  - ipyleaflet=0.12.3=py_1
  - ipython=7.13.0=py37hc8dfbb8_2
  - ipython_genutils=0.2.0=py_1
  - ipywidgets=7.5.1=py_0
  - jedi=0.16.0=py37hc8dfbb8_1
  - jinja2=2.11.1=py_0
  - json5=0.9.0=py_0
  - jsonschema=3.2.0=py37hc8dfbb8_1
  - jupyter_client=6.1.2=py_0
  - jupyter_core=4.6.3=py37hc8dfbb8_1
  - jupyter_telemetry=0.0.5=py_0
  - jupyterhub=1.1.0=py37_2
  - jupyterhub-base=1.1.0=py37_2
  - jupyterlab=1.2.5=py_0
  - jupyterlab_server=1.1.0=py_0
  - krb5=1.16.4=h2fd8d38_0
  - ld_impl_linux-64=2.34=h53a641e_0
  - libblas=3.8.0=14_openblas
  - libcblas=3.8.0=14_openblas
  - libcurl=7.68.0=hda55be3_0
  - libedit=3.1.20170329=hf8c457e_1001
  - libffi=3.2.1=he1b5a44_1007
  - libgcc-ng=9.2.0=h24d8f2e_2
  - libgfortran-ng=7.3.0=hdf63c60_5
  - libgomp=9.2.0=h24d8f2e_2
  - liblapack=3.8.0=14_openblas
  - libopenblas=0.3.7=h5ec1e0e_6
  - libsodium=1.0.17=h516909a_0
  - libssh2=1.8.2=h22169c7_2
  - libstdcxx-ng=9.2.0=hdf63c60_2
  - libuv=1.34.0=h516909a_0
  - mako=1.1.0=py_0
  - markupsafe=1.1.1=py37h8f50634_1
  - mistune=0.8.4=py37h516909a_1000
  - nbconvert=5.6.1=py37_0
  - nbformat=5.0.4=py_0
  - ncurses=6.1=hf484d3e_1002
  - nodejs=13.10.1=hf5d1a2b_0
  - notebook=6.0.3=py37_0
  - numpy=1.18.1=py37h8960a57_1
  - oauthlib=3.0.1=py_0
  - openssl=1.1.1f=h516909a_0
  - pamela=1.0.0=py_0
  - pandas=1.0.3=py37h0da4684_0
  - pandoc=2.9.2=0
  - pandocfilters=1.4.2=py_1
  - parso=0.6.2=py_0
  - pexpect=4.8.0=py37hc8dfbb8_1
  - pickleshare=0.7.5=py37hc8dfbb8_1001
  - pip=20.0.2=py_2
  - prometheus_client=0.7.1=py_0
  - prompt-toolkit=3.0.5=py_0
  - ptyprocess=0.6.0=py_1001
  - pycosat=0.6.3=py37h8f50634_1004
  - pycparser=2.20=py_0
  - pycurl=7.43.0.5=py37h16ce93b_0
  - pygments=2.6.1=py_0
  - pyjwt=1.7.1=py_0
  - pyopenssl=19.1.0=py_1
  - pyrsistent=0.16.0=py37h8f50634_0
  - pysocks=1.7.1=py37hc8dfbb8_1
  - python=3.7.6=h8356626_5_cpython
  - python-dateutil=2.8.1=py_0
  - python-editor=1.0.4=py_0
  - python-json-logger=0.1.11=py_0
  - python_abi=3.7=1_cp37m
  - pytz=2019.3=py_0
  - pyzmq=19.0.0=py37hac76be4_1
  - readline=8.0=hf8c457e_0
  - requests=2.23.0=pyh8c360ce_2
  - ruamel.yaml=0.16.6=py37h8f50634_1
  - ruamel.yaml.clib=0.2.0=py37h8f50634_1
  - ruamel_yaml=0.15.80=py37h8f50634_1001
  - send2trash=1.5.0=py_0
  - setuptools=46.1.3=py37hc8dfbb8_0
  - six=1.14.0=py_1
  - sqlalchemy=1.3.15=py37h8f50634_1
  - sqlite=3.30.1=hcee41ef_0
  - terminado=0.8.3=py37hc8dfbb8_1
  - testpath=0.4.4=py_0
  - tini=0.18.0=h14c3975_1001
  - tk=8.6.10=hed695b0_0
  - tornado=6.0.4=py37h8f50634_1
  - tqdm=4.45.0=pyh9f0ad1d_0
  - traitlets=4.3.3=py37hc8dfbb8_1
  - traittypes=0.2.1=py_1
  - urllib3=1.25.7=py37hc8dfbb8_1
  - wcwidth=0.1.9=pyh9f0ad1d_0
  - webencodings=0.5.1=py_1
  - wheel=0.34.2=py_1
  - widgetsnbextension=3.5.1=py37_0
  - xarray=0.15.1=py_0
  - xz=5.2.4=h516909a_1002
  - yaml=0.2.2=h516909a_1
  - zeromq=4.3.2=he1b5a44_2
  - zipp=3.1.0=py_0
  - zlib=1.2.11=h516909a_1006
  - pip:
    - beautifulsoup4==4.8.2
    - bs4==0.0.1
    - jupyterlab-spark-ui-tab==0.0.2
    - soupsieve==2.0
prefix: /opt/conda

jupyter labextension list

$ jupyter labextension list
JupyterLab v1.2.5
Known labextensions:
   app dir: /opt/conda/share/jupyter/lab
        @jupyter-widgets/jupyterlab-manager v1.1.0  enabled  OK
        jupyter-leaflet v0.12.3  enabled  OK

[metasim]

@martinRenou I just rebuilt with 0.12.6 and I’m back to the Error displaying widget: model not found message in the Jupyter output cell. In the browser console the error is Uncaught (in promise) Error: Module jupyter-leaflet, semver range ^0.12.6 is not registered as a widget module

Here’s the current set of plugins. Has anyone else reported anything similar? Or am I a snowflake ❄️ here? 😄

jupyter labextension list

$ jupyter labextension list
        @jupyter-widgets/jupyterlab-manager v1.1.0  enabled  OK
        @jupyter-widgets/jupyterlab-sidecar v0.4.0  enabled  OK
        @jupyterlab/geojson-extension v1.0.0  enabled  OK
        @jupyterlab/git v0.9.0  enabled  OK
        @jupyterlab/shortcutui v0.4.0  enabled  OK
        jupyter-leaflet v0.12.6  enabled  OK
        nbdime-jupyterlab v1.0.0  enabled  OK

[metasim]

Confirmation: I pinned the following versions and things are now working 😅 :

• @jupyter-widgets/jupyterlab-manager@1.1
• ipyleaflet==0.12.2
• jupyter-leaflet@0.12.2