yassine34 on "New pages can't be viewed"

I create a blog, and the home page it works fine, but when I create a new page like ( Info or whatever) I see just ( 404 Error File Not Found
The page you are looking for might have been removed,
had it's name changed, or is temporarily unavailable.)

I checked the url, and it's correct, but I don't understand the problem.
My blog is : http://www.pet-hair-removal.net/

Somebody can help??