Installation Jupyter plug-in in Moodle

We are installing the plugin Jupyter in Moodle 4.1

and after installation we get a fuzzy error when trying to save an Jupyter activity in Moodle.

The jupyter file, we use, works on the Jupyterserver we have build.

Do you have experience with installing Jupyter plugin in Moodle? Please can you give me some tips to get a proper installation.