course page is blank

Hi, I’m using learnpress to build an educational website and I was trying to upload a course to test how it works, but course page that was built by learnpress itself, is absolutely blank, it doesn’t even show an error or my header, it’s just blank. I tried changing the page for courses in setting twice, but the same problem appeared, or it says nothing is found in here.

The page I need help with: [log in to see the link]