Notebbok not found

I am unable to get or load the notebook in any of the two section
please help me with this


Sometimes you have to refresh the page for the notebook to load.

If you are not able to see the built-in notebook in the course, try refreshing your page, or open it in another browser. If you want to download the notebook, click on the Jupyter logo at the top-left side of the notebook in order to access the files.