By default, the ipynb notebook uses a [unlTools](https://gitlab.tetras-libre.fr/unl/unlTools) jar executable to convert UNL texts to SVG graphs.
You can download the jar in the [release section of unlTools](https://gitlab.tetras-libre.fr/unl/unlTools/-/releases), it must be placed in the same directory as the notebook.
This is the recommended way to execute an entire notebook.
As an alternative, you can modify the second cell of the notebook so it uses the unl2rdf Webservice instead of a local jar.