Warning: require_once(C:\xampp\htdocs\schmitt\includes\defines.php) [function.require-once]: failed to open stream: Invalid argument in C:\xampp\htdocs\schmitt\index.php on line 21

Fatal error: require_once() [function.require]: Failed opening required 'C:\xampp\htdocs\schmitt\includes\defines.php' (include_path='.;C:\xampp\php\pear\') in C:\xampp\htdocs\schmitt\index.php on line 21