Warning: require(functions/sql.php) [function.require]: failed to open stream: No such file or directory in /var/www/cdx31/html/index.php on line 20

Fatal error: require() [function.require]: Failed opening required 'functions/sql.php' (include_path='/var/www/cdx31/html/') in /var/www/cdx31/html/index.php on line 20