When running the code from the example (https://ipyleaflet.readthedocs.io/en/latest/api_reference/map.html#example), no map get displayed.

from ipyleaflet import Map, basemaps, basemap_to_tiles

m = Map(
    layers=(basemap_to_tiles(basemaps.NASAGIBS.ModisTerraTrueColorCR, "2017-04-08"), ),
    center=(52.204793, 360.121558),


No error message pops up. The map object gets created:

>>> ipyleaflet.leaflet.Map

It just doesn't get rendered. Any hints?

EDIT: after a while, this message appears : "A Jupyter widget could not be displayed because the widget state could not be found. This could happen if the kernel storing the widget is no longer available, or if the widget state was not saved in the notebook. You may be able to create the widget by running the appropriate cells."

It suggests that something with the widget is not working, but I can't understand what.

Versions: ipyleaflet: 0.9.1 ipywidgets: 7.4.2

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