i got a little error trying to implement a MaintenanceListener service, who will display a maintenance page
Here's my services.yml

```
# https://symfony.com/doc/current/service_container.html
services:
    # default configuration for services in *this* file
    _defaults:
        # automatically injects dependencies in your services
        autowire: true
        # automatically registers your services as commands, event subscribers, etc.
        autoconfigure: true
        # this means you cannot fetch services directly from the container via $container->get()
        # if you need to do this, you can override this setting on individual services
        public: false

    # makes classes in Cocorico\CoreBundle\DataFixtures\ORM\ available to be used as services
    # this creates a service per class whose id is the fully-qualified class name

#    Cocorico\CoreBundle\DataFixtures\ORM\:
#        resource: '../../src/Cocorico/CoreBundle/DataFixtures/ORM/*'

    # makes classes in src/AppBundle available to be used as services
    # this creates a service per class whose id is the fully-qualified class name
    AppBundle\:
        resource: '../../src/AppBundle/*'
        # you can exclude directories or files
        # but if a service is unused, it's removed anyway
        exclude: '../../src/AppBundle/{Entity,Repository,Tests,Event}'

    # controllers are imported separately to make sure they're public
    # and have a tag that allows actions to type-hint services
#    AppBundle\Controller\:
#        resource: '../../src/AppBundle/Controller'
#        public: true
#        tags: ['controller.service_arguments']

    # add more services, or override services that need manual wiring
    # AppBundle\Service\ExampleService:
    #     arguments:
    #         $someArgument: 'some_value'
    maintenance_listener:
        class: AppBundle\Event\MaintenanceListener
        arguments:
        tags:
            - { name: kernel.event_listener, event: kernel.request, method: onKernelRequest }```

```

Here's my class:

```
<?php

namespace MListener;

use Symfony\Component\HttpKernel\Event\GetResponseEvent;
use Symfony\Component\HttpFoundation\Response;

class MListener
{
    public function onKernelRequest(GetResponseEvent $event)
    {
        $event->setResponse(new Response('Iziparty is in maintenance mode', Response::HTTP_SERVICE_UNAVAILABLE));
        $event->stopPropagation();
    }
}

```

and here's the error i get:
FastCGI sent in stderr: "PHP message: PHP Fatal error: Cannot declare class MListener\MListener, because the name is already in use in /var/www/Symfony/src/AppBundle/Event/MaintenanceListener.php on line 9" while reading response header from upstream
Thanks for the help.