When I make a page and go to "Preview" id displays. But when I assign a parent in "Page Attributs" and click on "Preview" I get the error message "Apologies, but no results were found for the requested archive". I get the same error message when I try to just open the link. When I change to "(no parent)" it displays fine.
This only happens when I choose one particular page as a parent. When I choose a different page (same template, though) it works fine.
I tried deleting the parent page and creating it new but the same thing happens. I cannot see what is different in this particular page. What am I doing wrong?