Error: 403 Forbidden

If you are the website owner:

You have not uploaded an index page (index.html or index.htm or index.php) in this current directory, and therefore a 403 error has occurred. If you feel you have uploaded an index file, make sure it is in lowercase (e.g. not Index.html).

I've published my files correctly using wysiwyg web builder, then why do i get this message? and what should i do to fix this? Please people i need help.. wacko.gif