“<< previous entries” pointing to an empty page

Hi,

“<< previous entries” appears in my wordpress 1.5 weblog when must no appear. Please go into https://snipurl.com/d524. Here is all ok. But now click on ?? Articulos anteriores (previous entries). In the new page you can see a unnecessary << previous entries link pointing to a “not found” page. Anybody knows how can I solve this?

Thanks in advance.