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PHP Introducing MVC Frameworks in PHP Model View Controller Slim MVP

I get an error when running on local machine

The warning shows:

Warning: require(C:\Users\wangr\Desktop\slimtest/../vendor/autoload.php): failed to open stream: No such file or directory in C:\Users\wangr\Desktop\slimtest\index.php on line 6

Fatal error: require(): Failed opening required 'C:\Users\wangr\Desktop\slimtest/../vendor/autoload.php' (include_path='.;C:\php\pear') in C:\Users\wangr\Desktop\slimtest\index.php on line 6

And I cannot access to /hello/name.

I have followed step by step the video, my index.php:

use Psr\Http\Message\ResponseInterface as Response;
use Psr\Http\Message\ServerRequestInterface as Request;
use Slim\Factory\AppFactory;

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

$app = AppFactory::create();

$app->get('/hello/{name}', function (Request $request, Response $response, array $args) {
    $name = $args['name'];
    $response->getBody()->write("Hello, $name");
    return $response;


and I do have used command composer install, it seems all packages are duly installed.

Can you help me figure out?