Slim. Не могу запустить “Hello World”

Хочу изучить Slim v4 для RESTFull сервера.

Открыл Installation на офф. сайте. Следовал строго по инструкции. На шаге №3 выбрал Slim PSR-7.

При запуске приложения получаю следующую ошибку:

Fatal error: Uncaught Slim\Exception\HttpNotFoundException: Not found. in C:\xampp\htdocs\test.com\vendor\slim\slim\Slim\Middleware\RoutingMiddleware.php:91 Stack trace: #0 C:\xampp\htdocs\test.com\vendor\slim\slim\Slim\Routing\RouteRunner.php(60): Slim\Middleware\RoutingMiddleware->performRouting(Object(Slim\Psr7\Request)) #1 C:\xampp\htdocs\test.com\vendor\slim\slim\Slim\MiddlewareDispatcher.php(64): Slim\Routing\RouteRunner->handle(Object(Slim\Psr7\Request)) #2 C:\xampp\htdocs\test.com\vendor\slim\slim\Slim\App.php(174): Slim\MiddlewareDispatcher->handle(Object(Slim\Psr7\Request)) #3 C:\xampp\htdocs\test.com\vendor\slim\slim\Slim\App.php(158): Slim\App->handle(Object(Slim\Psr7\Request)) #4 C:\xampp\htdocs\test.com\index.php(16): Slim\App->run() #5 {main} thrown in C:\xampp\htdocs\test.com\vendor\slim\slim\Slim\Middleware\RoutingMiddleware.php on line

Структура проекта:

test.com
--> vendor
--> .htaccess
--> composer.json
--> composer.lock
--> index.php

Содержимое composer.json

{
    "require": {
        "slim/slim": "^4.0.0",
        "slim/psr7": "^0.4.0"
    }

Содержимое index.php

<?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('/', function (Request $request, Response $response, $args) {
    $response->getBody()->write("Hello world!");
    return $response;
});
$app->run();
}

XAMPP v3.2.2

Apache/2.4.38 (Win64) OpenSSL/1.1.1a PHP/7.3.2