I have created again the menu to than category and now works perfectly.
But the other problem I still can not solved.
I realized than in the url when I click in one of the books in "My books" the url its not completed, I mean, it is not the id of the categorie, ei, the url is "?task=view&id=39&catid=", so i get the message: "You have not access to this page"
But when I access to the same book through the categorie or books menu its works perfectly and the url shows "?task=view&id=39&catid=52"
Thank you for your help