Warning: require(vendor/autoload.php): failed to open stream: No such file or directory in C:\xampp7\htdocs\edgpens\extension\PHPMailer-master\get_oauth_token - Copy.php on line 61

Fatal error: require(): Failed opening required 'vendor/autoload.php' (include_path='C:\xampp7\php\PEAR') in C:\xampp7\htdocs\edgpens\extension\PHPMailer-master\get_oauth_token - Copy.php on line 61