Api platform Errors Handling Exception?

When I want to get item with URL http://127.0.0.1:8000/actualites/1 it throw exception "hydra:description": "Not Found". I tried to custom this exception with Errors Handling - API Platform: Documentation, nothing change!!

app/src/Exception/ActualiteNotFoundException.php

<?phpnamespace App\Exception;final class ActualiteNotFoundException extends \Exception{}

EventSubscriber

<?php// app/src/EventSubscriber/ActualiteManager.phpnamespace App\EventSubscriber;use ApiPlatform\Core\EventListener\EventPriorities;use App\Entity\Actualite;use App\Exception\ActualiteNotFoundException;use Symfony\Component\EventDispatcher\EventSubscriberInterface;use Symfony\Component\HttpFoundation\Request;use Symfony\Component\HttpKernel\Event\GetResponseForControllerResultEvent;use Symfony\Component\HttpKernel\KernelEvents;final class ActualiteManager implements EventSubscriberInterface{    public static function getSubscribedEvents(): array    {        return [            KernelEvents::VIEW => ['checkProductAvailability', EventPriorities::PRE_VALIDATE],        ];    }    public function checkProductAvailability(GetResponseForControllerResultEvent $event): void    {        $actualite= $event->getControllerResult();        if (!$actualite instanceof Actualite|| !$event->getRequest()->isMethodSafe(false)) {            return;        }        if (!$product->isPubliclyAvailable()) {            // Using internal codes for a better understanding of what's going on            throw new ActualiteNotFoundException(sprintf('The Actualite  does not exist !));        }    }}

config

# config/packages/api_platform.yamlapi_platform:    # ...    exception_to_status:        # The 4 following handlers are registered by default, keep those lines to prevent unexpected side effects        Symfony\Component\Serializer\Exception\ExceptionInterface: 400 # Use a raw status code (recommended)        ApiPlatform\Core\Exception\InvalidArgumentException: 'HTTP_BAD_REQUEST' # Or a `Symfony\Component\HttpFoundation\Response`'s constant        ApiPlatform\Core\Exception\FilterValidationException: 400        Doctrine\ORM\OptimisticLockException: 409        # Custom mapping        App\Exception\ActualiteNotFoundException: 404 # Here is the handler for our custom exception

How can i custom the exception 404 not found ?