Hm. I see it very strange that you don't have any links in your navigation-field.
Usually when a user tries to remove the "Home.htm" site, he would find it impossible. The same regarding your error code..
Are you sure that you haven't pasted some strange Css/Html code somewhere, either at any of your subpage, or in the "Edit-design"-section?
Maybe I have to look more into it. Try removing every code in the Edit-design section, if it doesn't work then, write in this thread again, or contact me personally.
Henrik - www.karibu-design.page.tl