Warning: require_once(../vendor/autoload.php): Failed to open stream: No such file or directory in D:\Application\www\E-Tracking\vendor\nexmo\client\examples\send.php on line 3

Fatal error: Uncaught Error: Failed opening required '../vendor/autoload.php' (include_path='C:\WebServer\xampp\php\PEAR') in D:\Application\www\E-Tracking\vendor\nexmo\client\examples\send.php:3 Stack trace: #0 {main} thrown in D:\Application\www\E-Tracking\vendor\nexmo\client\examples\send.php on line 3