Slim routing in PHP-DI container

I’m moving a project of mine into Slim Microframework, by using PHP-DI containerization.
I need to POST some JSON data to http://localhost/api/base (XAMPP) and get a confirmation (at least at the beginning).
This is my index.php:

<?php

use PsrHttpMessageResponseInterface as Response;
use PsrHttpMessageServerRequestInterface as Request;
use SlimFactoryAppFactory;
use SlimExceptionHttpMethodNotAllowedException;
use SlimExceptionHttpNotFoundException;
use SlimRoutingRouteContext;
use DIContainerBuilder;

// Set error reporting to display all errors
error_reporting(E_ALL);
ini_set('display_errors', 'On');

// Autoloading using Composer's autoload
require __DIR__ . '/../vendor/autoload.php';

// Include dependencies file
$container = require_once __DIR__ . '/../config/dependencies.php';

// Create Slim app
$app = AppFactory::create();

// Include routes
require __DIR__ . '/../src/routes.php';

$app->run();

This is routes.php:

<?php

use PsrHttpMessageResponseInterface as Response;
use PsrHttpMessageServerRequestInterface as Request;
use AppControllersHotelBaseController;

// Include dependencies file
$container = require_once __DIR__ . '/../config/dependencies.php';

// Define basic route
$app->get('/', function (Request $request, Response $response) {
    $response->getBody()->write('Hello, World!');
    return $response;
});


// Route for handling POST request to /api/base
$app->post('/api/base', function (Request $request, Response $response) use ($container) {
    // Get the HotelBaseController service from the container
    $hotelBaseController = $container->get('HotelBaseController');

    // Call the handlePostRequest method
    return $hotelBaseController->handlePostRequest($request, $response);
});


$app->get('/api/base/', function (Request $request, Response $response) {
    return $response->withStatus(301)->withHeader('Location', '/api/base');
});

This is the dependencies.php:

<?php

use DIContainerBuilder;
// use PsrHttpMessageResponseInterface as Response;
// use PsrHttpMessageServerRequestInterface as Request;

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

// Create ContainerBuilder instance
$containerBuilder = new ContainerBuilder();

// Set up your container configuration
$containerBuilder->addDefinitions([
    'HotelBaseController' => DIcreate(AppControllersHotelBaseController::class),
]);

// Build the container
return $containerBuilder->build();

And, finally, this is hotelBaseController.php:

<?php

namespace AppControllers;

use PsrHttpMessageResponseInterface as Response;
use PsrHttpMessageServerRequestInterface as Request;

class HotelBaseController {
    public function handlePostRequest(Request $request, Response $response) {
        // Get the JSON data from the request body
        $data = $request->getParsedBody();

        // You can access the individual fields from the JSON data
        $userId = $data['userId'] ?? '';
        $apiKey = $data['apiKey'] ?? '';
        $documentType = $data['document_type'] ?? '';
        $hotelId = $data['hotel_id'] ?? '';
        $hotelName = $data['name'] ?? '';

        $res = 'Who knows';
        
        return $res;
    }
}

?>

When sending any POST request, containing a simple JSON, I get the error:

<b>Fatal error</b>: Uncaught Error: Call to a member function get() on bool in C:xampphtdocssrcroutes.php:20
Stack trace:
#0 C:xampphtdocsvendorslimslimSlimHandlersStrategiesRequestResponse.php(38):
{closure}(Object(SlimHttpServerRequest), Object(SlimHttpResponse), Array)
#1 C:xampphtdocsvendorslimslimSlimRoutingRoute.php(358):
SlimHandlersStrategiesRequestResponse-&gt;__invoke(Object(Closure), Object(SlimHttpServerRequest),
Object(SlimHttpResponse), Array)
#2 C:xampphtdocsvendorslimslimSlimMiddlewareDispatcher.php(65):
SlimRoutingRoute-&gt;handle(Object(SlimHttpServerRequest))
#3 C:xampphtdocsvendorslimslimSlimMiddlewareDispatcher.php(65):
SlimMiddlewareDispatcher-&gt;handle(Object(SlimHttpServerRequest))
#4 C:xampphtdocsvendorslimslimSlimRoutingRoute.php(315):
SlimMiddlewareDispatcher-&gt;handle(Object(SlimHttpServerRequest))
#5 C:xampphtdocsvendorslimslimSlimRoutingRouteRunner.php(68):
SlimRoutingRoute-&gt;run(Object(SlimHttpServerRequest))
#6 C:xampphtdocsvendorslimslimSlimMiddlewareDispatcher.php(65):
SlimRoutingRouteRunner-&gt;handle(Object(SlimHttpServerRequest))
#7 C:xampphtdocsvendorslimslimSlimApp.php(199):
SlimMiddlewareDispatcher-&gt;handle(Object(SlimHttpServerRequest))
#8 C:xampphtdocsvendorslimslimSlimApp.php(183): SlimApp-&gt;handle(Object(SlimHttpServerRequest))
#9 C:xampphtdocspublicindex.php(50): SlimApp-&gt;run()
#10 {main}
thrown in <b>C:xampphtdocssrcroutes.php</b> on line <b>20</b><br />

I would like to understand where am I making a mistake.
Thanks