Problem after installing script on site

After i go to mydomain/admin/install.php and fill in my username, password, database and server, i get this message : Warning: require_once(/home/flowrab5/public_html/include/price_functions.php) [function.require-once]: failed to open stream: No such file or directory in /home/flowrab5/public_html/config.php on line 131 Fatal error: require_once() [function.require]: Failed opening required '/home/flowrab5/public_html/include/price_functions.php' (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/flowrab5/public_html/config.php on line 131 Does anyone know what this means, or how it can be fixed? PLEASE HELP!