Issues with first run of notebooker

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Hi,

I have tried to go through the install explained there:
https://notebooker.readthedocs.io/en/latest/setup.html#first-run-of-notebooker

I have mongodb running, but when I try to access the app, I get an error
Internal Server Error The server encountered an internal error and was unable to complete your request. Either the server is overloaded or there is an error in the application.

and can see in the logs:
KeyError: 'notebook_templates_example'

In mongodb, the notebooker database and the NOTEBOOK_OUTPUT_scheduler collection has been well created.

Thanks