Those are warnings and you can ignore them.
Assuming there are no actual errors (marked in red X, the warnings are an orange ! ) you should be able to run the application just fine.
Hi Sjoerd,
Thank you for reaching out. These are not errors, but warnings. You can run your app with these warnings, but in general warnings would also be something to look into. For instance: "No on click" is referring to an element that exists (eg button or menu item) that has no purpose at this point, because clicking it doesn't trigger an action. In your specific case these warnings are related to Atlas (design system) for elements you are not using.
For more information on errors and warnings you can check out the documentation.
Good luck with the rest of your learning.
Micha Friede
Developer Learning Lead