[support] FCKEditor and Page not found when I edit a page

Hi all. I have installed FCKEditor. I have my content type XYZ (only body+title for my client) and this is my node-XYZ.tpl.php:

<a class="boxSel Rosso margRG" href="#"> <p>bla bla bla</p> <img height="41" width="240" alt="image" src="/images/rosso/btn_boxRosso_interno.jpg"/> </a> <div id="ContentTxtSezione" class="BordoRosso"> <?php drupal_add_css(path_to_theme() . '/css/sez_rosso.css','theme'); echo $node->content['body']['#value']; ?> </div>

Now the problem: when I active fckeditor and try to edit a XYZ node in the body textarea I see a "page not found message" (with all site template (header, error message and footer) and not only the node template(body)). Why this ? Where is my error ?

M.