Extend du FOSUserBundle

Bonjour,

Voila je rencontre un petit problème avec mon code.

Ce que je fais

Je cherche à intégrer FOSUserBundle à mon projet SonataAdminBundle. La configuration a été faite, j'ai suivi toutes les étapes indiquées sur ce lien : https://sonata-project.org/bundles/user/3-x/doc/reference/installation.html
Par la suite, j'ai fais un extend du FOS bundle sur le dossier src du projet :

php bin/console sonata:easy-extends:generate SonataUserBundle -d src

Mon composer.json :

{
    "type": "project",
    "license": "proprietary",
    "require": {
        "php": "^7.1.3",
        "ext-ctype": "*",
        "ext-iconv": "*",
        "friendsofsymfony/user-bundle": "^2.1",
        "sensio/framework-extra-bundle": "^5.1",
        "sonata-project/admin-bundle": "^3.48",
        "sonata-project/doctrine-orm-admin-bundle": "^3.8",
        "sonata-project/user-bundle": "^4.3",
        "symfony/acl-bundle": "^1.0",
        "symfony/asset": "4.2.*",
        "symfony/console": "4.2.*",
        "symfony/dotenv": "4.2.*",
        "symfony/expression-language": "4.2.*",
        "symfony/flex": "^1.1",
        "symfony/form": "4.2.*",
        "symfony/framework-bundle": "4.2.*",
        "symfony/monolog-bundle": "^3.1",
        "symfony/orm-pack": "*",
        "symfony/process": "4.2.*",
        "symfony/security-bundle": "4.2.*",
        "symfony/serializer-pack": "*",
        "symfony/swiftmailer-bundle": "^3.1",
        "symfony/translation": "4.2.*",
        "symfony/twig-bundle": "4.2.*",
        "symfony/validator": "4.2.*",
        "symfony/web-link": "4.2.*",
        "symfony/yaml": "4.2.*"
    },
    "require-dev": {
        "symfony/debug-pack": "*",
        "symfony/maker-bundle": "^1.0",
        "symfony/profiler-pack": "*",
        "symfony/test-pack": "*",
        "symfony/web-server-bundle": "4.2.*"
    },
    "config": {
        "preferred-install": {
            "*": "dist"
        },
        "sort-packages": true
    },
    "autoload": {
        "psr-4": {
            "App\\": "src/"
        }
    },
    "autoload-dev": {
        "psr-4": {
            "App\\Tests\\": "tests/"
        }
    },
    "replace": {
        "paragonie/random_compat": "2.*",
        "symfony/polyfill-ctype": "*",
        "symfony/polyfill-iconv": "*",
        "symfony/polyfill-php71": "*",
        "symfony/polyfill-php70": "*",
        "symfony/polyfill-php56": "*"
    },
    "scripts": {
        "auto-scripts": {
            "cache:clear": "symfony-cmd",
            "assets:install %PUBLIC_DIR%": "symfony-cmd"
        },
        "post-install-cmd": [
            "@auto-scripts"
        ],
        "post-update-cmd": [
            "@auto-scripts"
        ]
    },
    "conflict": {
        "symfony/symfony": "*"
    },
    "extra": {
        "symfony": {
            "allow-contrib": false,
            "require": "4.2.*"
        }
    }
}

Ce que je veux

Décrivez ici ce que vous cherchez à obtenir

Ce que j'obtiens

Après tout ça, j'obtiens l'erreur suivante :
Fatal error: Uncaught Symfony\Component\Debug\Exception\ClassNotFoundException: Attempted to loadaround class "ApplicationSonataUserBundle" from namespace "Application\Sonata\UserBundle".aroundDid you forget a "use" statement for another namespace? in C:\wamp64\www\staff\src\Kernel.php:23aroundStack trace:around#0 C:\wamp64\www\staff\vendor\symfony\http-kernel\Kernel.php(424): App\Kernel->registerBundles()around#1 C:\wamp64\www\staff\vendor\symfony\http-kernel\Kernel.php(130): Symfony\Component\HttpKernel\Karoundernel->initializeBundles()around#2 C:\wamp64\www\staff\vendor\symfony\framework-bundle\Console\Application.php(65): Symfony\Compoaroundnent\HttpKernel\Kernel->boot()around#3 C:\wamp64\www\staff\vendor\symfony\console\Application.php(145): Symfony\Bundle\FrameworkBundlarounde\Console\Application->doRun(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Coaroundmponent\Console\Output\ConsoleOutput))around#4 C:\wamp64\www\staff\bin\console(38): Symfony\Component\Console\Application->run(Object(Symfonyaround\Component\Console\Input\ArgvInput))around#5 {main}around thrown in C:\wamp64\www\staff\src\Kernel.php on line 23****

Ma classe :

<?php

namespace Application\Sonata\UserBundle;

use Symfony\Component\HttpKernel\Bundle\Bundle;

/**
 * This file has been generated by the SonataEasyExtendsBundle.
 *
 * @link https://sonata-project.org/easy-extends
 *
 * References:
 * @link http://symfony.com/doc/current/book/bundles.html
 */
class ApplicationSonataUserBundle extends Bundle
{
    /**
     * {@inheritdoc}
     */
    public function getParent()
    {
        return 'SonataUserBundle';
    }
}

Du coup, j'ai modifié le code suivant :

"autoload": {
        "psr-4": {
            "App\\": "src/",
            "Application\\": "src/Application/"
        }
    },

Par la suite, j'ai ça comme erreur :
Fatal error: Cannot declare class Application\Sonata\UserBundle\ApplicationSonataUserBundle, beca
use the name is already in use in C:\wamp64\www\staff\src\Application\Sonata\UserBundle\Applicati
onSonataUserBundle.php on line 24

Vous avez une idée sur la raison du problème ?

Merci d'avance