Warning: require(vendor/autoload.php): Failed to open stream: No such file or directory in D:\HTTP\htdocs\gincludes\PHPMailer-master_old\get_oauth_token.php on line 59

Fatal error: Uncaught Error: Failed opening required 'vendor/autoload.php' (include_path='D:\xampp\php\PEAR') in D:\HTTP\htdocs\gincludes\PHPMailer-master_old\get_oauth_token.php:59 Stack trace: #0 {main} thrown in D:\HTTP\htdocs\gincludes\PHPMailer-master_old\get_oauth_token.php on line 59