Thanks nnikolov, I already did that.
Hello, re_ch21,
The pages are not deleted, I also think is the path is incorrect. But I don’t know how to solve it.
The problem is the site has three main pages, for english, spanish and portuguese, (I don’t know who thought it was a good idea), and the menues are synchronizated by WPML, I think there is the problem. When I try to add a page into the spanish menu (the page actually exist) the error 404 shows.