your main page to your site has to be index.htm or index.html
you are missing your index.html page or such for it to recognize it
if you named your homepage something else then just rename it to index.html
that is the page it is trying to find. If you have it in some other directory in your root area then you need to move it out of that sub directory and have it in your main area
not sure how you have made your page and things either as far as editors etc