I am wondering why this is happening; I am clicking on my other pages than blog, and then it comes up a text like this: "Not Found. The requested URL /about was not found on this server."
The page is in my admin under Pages. When I went and changed something for a few minutes ago from the admin panel at my "About" page, and then tried to look at it, the same text came again.
What is happened? What should I do?