Warning: require(vendor/autoload.php): failed to open stream: No such file or directory in E:\www\flone\previflone\grr\phpmailer.old\get_oauth_token.php on line 18

Fatal error: require(): Failed opening required 'vendor/autoload.php' (include_path='E:\XAMPP\php\PEAR') in E:\www\flone\previflone\grr\phpmailer.old\get_oauth_token.php on line 18