Impossible find page

Hi!

I’m doing some tests to create a course with lessons and final test…
but when I click on lesson or test link, “oops! Impossible find the page” appears ( http://www.rovpilot.org/wpsite/quizzes/elettrotecnica-test/ )… how can I do to make my course visible?

Thanks!

https://wordpress.org/plugins/learnpress/