Warning: require(application/config/constants.php) [function.require]: failed to open stream: No such file or directory in /var/www/html/system/codeigniter/CodeIgniter.php on line 52

Fatal error: require() [function.require]: Failed opening required 'application/config/constants.php' (include_path='.:/usr/share/pear:/usr/share/php') in /var/www/html/system/codeigniter/CodeIgniter.php on line 52