Warning: require(DB_CONFIG_LANG) [function.require]: failed to open stream: No such file or directory in /index.php on line 10

Warning: require_once(DIR_LANGLANGUAGE.php) [function.require-once]: failed to open stream: No such file or directory in /index.php on line 15

Fatal error: require_once() [function.require]: Failed opening required 'DIR_LANGLANGUAGE.php' (include_path='.:/:/usr/local/php/pear5') in /index.php on line 15