Setup Fatal Error

I created my own theme, and am trying to set up wordpress on my site. I’ve set up all the database information, and when going to “www.sitename.com/wp-admin/install.php” the error: “
Fatal error: require() [function.require]: Failed opening required ‘/home/a3724579/public_html/wp-includes/class-wp.php’ (include_path=’.:/usr/lib/php:/usr/local/lib/php’) in /home/a3724579/public_html/wp-settings.php on line 68″ What does this mean?