worksheets inaccessible in 7.3 after attempt to upgrade to Jupytern

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In SageMath 7.3, there is a tool to convert Sage worksheets to Jupyter notebooks:

1/ Run

sage -n export --list

to get the list of your Sage worksheets, the item no. XX being displayed as

admin:XX   | name_of_the_worksheet

2/ Convert the worksheet no. XX to Jupyter format (ipynb) by

sage -n export --ipynb=output_name.ipynb admin:XX

You should still be able to run the normal notebook by opening a Terminal window (one of the options in the menu bar item, in the Mac app) and running

sage -n # sagenb still default

or, from the sage command prompt,

sage: notebook()

Eventually these will have to be replaced with the correct type of notebook, something along the lines of

sage --notebook=sagenb

All the notebooks should still be in the same location as before.