The directory /blog/2010/01/13/card-shonborn-medjugorje-come-lourdes-una-scuola-della-fede-quotidiana/ does not contain an index file.
You have to create a page called index.html, index.htm or index.php (lower case).
Warning: if you have just activated your site you might have to wait up to 24 hours before it is visible.