Warning: require_once(__DIR__/composer/autoload_real.php) [function.require-once]: failed to open stream: No such file or directory in D:\phpStudy\PHPTutorial\WWW\vendor\autoload.php on line 5

Fatal error: require_once() [function.require]: Failed opening required '__DIR__/composer/autoload_real.php' (include_path='.;C:\php5\pear') in D:\phpStudy\PHPTutorial\WWW\vendor\autoload.php on line 5