PHP Fatal error: Uncaught Error: Class 'Cryptomkt\Configuration'

[SARQUIS-BOUTROS]

Hi! i tried run this below code:

<?php

require  __DIR__.'/vendor/autoload.php';

use Cryptomkt\Client;
use Cryptomkt\Configuration;

$apiKey = 'dsfdsfdsfdsf';
$apiSecret = 'dasdsad33';
$configuration = Configuration::apiKey($apiKey, $apiSecret);
$client = Client::create($configuration);

$markets = $client->getMarkets();

echo $markets;

but return next error:
C:\Users\HECTOR\Desktop\Project MKT\Project1-WOS>php index.php
PHP Fatal error: Uncaught Error: Class 'Cryptomkt\Configuration' not found in C:\Users\HECTOR\Desktop\Project MKT\Project1-WOS\index.php:10
Stack trace:
#0 {main}
thrown in C:\Users\HECTOR\Desktop\Project MKT\Project1-WOS\index.php on line 10

Fatal error: Uncaught Error: Class 'Cryptomkt\Configuration' not found in C:\Users\HECTOR\Desktop\Project MKT\Project1-WOS\index.php:10
Stack trace:
#0 {main}
thrown in C:\Users\HECTOR\Desktop\Project MKT\Project1-WOS\index.php on line 10

already install composer. What Kind of type problem can be?
Thanks