Warning: include(lang/.php) [function.include]: failed to open stream: No such file or directory in C:\xampp\security\htdocs\navi.php on line 12

Warning: include() [function.include]: Failed opening 'lang/.php' for inclusion (include_path='.;C:\xampp\php\pear\') in C:\xampp\security\htdocs\navi.php on line 12

[PHP: 5.2.6]