Symfony | FOSUserBundle Erreur

Bonjour,

Je suis entrain d'apprendre à utilisé le framework Symfony, j'ai installer le bundle FOSUserBundle mais je recontre une erreur .

Voici mon code .

# src/FosSf3/MainBundle/Entity/User.php

<?php

namespace FosSf3\MainBundle\Entity;

use FOS\UserBundle\Model\User as BaseUser;
use Doctrine\ORM\Mapping as ORM;

/**
 * Class User
 * @package FosSf3\MainBundle\Entity
 * @ORM\Table(name="fos_user")
 * @ORM\Entity
 */
class User extends BaseUser
{
    const ROLE_SUPER_ADMIN = 'ROLE_SUPER_ADMIN';
    const ROLE_ADMIN = 'ROLE_ADMIN';
    const ROLE_USER = 'ROLE_USER';

    /**
     * @var integer
     *
     * @ORM\Column(name="id", type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    protected $id;

    /**
     * @var
     *
     * @ORM\Column(name="gender", type="string", length=255, nullable=true)
     */
    protected $gender;

    /**
     * @var
     *
     * @ORM\Column(name="firstname", type="string", length=255, nullable=true)
     */
    protected $firstname;

    /**
     * @var
     *
     * @ORM\Column(name="lastname", type="string", length=255, nullable=true)
     */
    protected $lastname;

    /**
     * @var
     *
     * @ORM\Column(name="address", type="text", nullable=true, nullable=true)
     */
    protected $address;

    /**
     * @var
     *
     * @ORM\Column(name="zip_code", type="string", length=255, nullable=true)
     */
    protected $zipCode;

    /**
     * @var
     *
     * @ORM\Column(name="city", type="string", length=255, nullable=true)
     */
    protected $city;

    /**
     * @var
     *
     * @ORM\Column(name="country", type="string", length=255, nullable=true)
     */
    protected $country;

    /**
     * @var
     *
     * @ORM\Column(name="phone", type="string", length=255, nullable=true)
     */
    protected $phone;

    /**
     * Constructor
     */
    public function __construct()
    {
        parent::__construct();
    }

    /**
     * @param mixed $gender
     */
    public function setGender($gender)
    {
        $this->gender = $gender;
    }

    /**
     * @return mixed
     */
    public function getGender()
    {
        return $this->gender;
    }

    /**
     * @param mixed $firstname
     */
    public function setFirstname($firstname)
    {
        $this->firstname = $firstname;
    }

    /**
     * @return mixed
     */
    public function getFirstname()
    {
        return $this->firstname;
    }

    /**
     * @param mixed $lastname
     */
    public function setLastname($lastname)
    {
        $this->lastname = $lastname;
    }

    /**
     * @return mixed
     */
    public function getLastname()
    {
        return $this->lastname;
    }

    /**
     * @param mixed $address
     */
    public function setAddress($address)
    {
        $this->address = $address;
    }

    /**
     * @return mixed
     */
    public function getAddress()
    {
        return $this->address;
    }

    /**
     * @param mixed $city
     */
    public function setCity($city)
    {
        $this->city = $city;
    }

    /**
     * @return mixed
     */
    public function getCity()
    {
        return $this->city;
    }

    /**
     * @param mixed $country
     */
    public function setCountry($country)
    {
        $this->country = $country;
    }

    /**
     * @return mixed
     */
    public function getCountry()
    {
        return $this->country;
    }

    /**
     * @param int $id
     */
    public function setId($id)
    {
        $this->id = $id;
    }

    /**
     * @return int
     */
    public function getId()
    {
        return $this->id;
    }

    /**
     * @param mixed $zipCode
     */
    public function setZipCode($zipCode)
    {
        $this->zipCode = $zipCode;
    }

    /**
     * @return mixed
     */
    public function getZipCode()
    {
        return $this->zipCode;
    }

    /**
     * @param mixed $phone
     */
    public function setPhone($phone)
    {
        $this->phone = $phone;
    }

    /**
     * @return mixed
     */
    public function getPhone()
    {
        return $this->phone;
    }

}

# app/config/config.yml

imports:
    - { resource: parameters.yml }
    - { resource: security.yml }
    - { resource: services.yml }

# Put parameters here that don't need to change on each machine where the app is deployed
# https://symfony.com/doc/current/best_practices/configuration.html#application-related-configuration
parameters:
    locale: en

framework:
    #esi: ~
    translator: { fallbacks: ['%locale%'] }
    secret: '%secret%'
    router:
        resource: '%kernel.project_dir%/app/config/routing.yml'
        strict_requirements: ~
    form: ~
    csrf_protection: ~
    validation: { enable_annotations: true }
    #serializer: { enable_annotations: true }
    templating:
        engines: ['twig']
    default_locale: '%locale%'
    trusted_hosts: ~
    session:
        # https://symfony.com/doc/current/reference/configuration/framework.html#handler-id
        handler_id: session.handler.native_file
        save_path: '%kernel.project_dir%/var/sessions/%kernel.environment%'
    fragments: ~
    http_method_override: true
    assets: ~
    php_errors:
        log: true

# Twig Configuration
twig:
    debug: '%kernel.debug%'
    strict_variables: '%kernel.debug%'

# Doctrine Configuration
doctrine:
    dbal:
        driver: pdo_mysql
        host: '%database_host%'
        port: '%database_port%'
        dbname: '%database_name%'
        user: '%database_user%'
        password: '%database_password%'
        charset: UTF8
        # if using pdo_sqlite as your database driver:
        #   1. add the path in parameters.yml
        #     e.g. database_path: '%kernel.project_dir%/var/data/data.sqlite'
        #   2. Uncomment database_path in parameters.yml.dist
        #   3. Uncomment next line:
        #path: '%database_path%'

    orm:
        auto_generate_proxy_classes: '%kernel.debug%'
        naming_strategy: doctrine.orm.naming_strategy.underscore
        auto_mapping: true

# Swiftmailer Configuration
swiftmailer:
    transport: '%mailer_transport%'
    host: '%mailer_host%'
    username: '%mailer_user%'
    password: '%mailer_password%'
    spool: { type: memory }

# FOS User Bundle
fos_user:
    db_driver: orm
    firewall_name: main
    user_class: FosSf3\MainBundle\Entity\User
    service:
        mailer: fos_user.mailer.twig_swift
    registration:
        form:
            type: FOS\UserBundle\Form\Type\RegistrationFormType
            name: fos_user_registration_form
            validation_groups: [Registration, Default]
        confirmation:
            enabled: true
            template: '@FOSUser/Registration/email.txt.twig'
    profile:
        form:
            type: FOS\UserBundle\Form\Type\ProfileFormType
            #validation_groups: [Profile, Default]
    resetting:
        email:
            template: '@FOSUser/Resetting/email.txt.twig'
    group:
        group_class: FosSf3\MainBundle\Entity\Group
    from_email:
        address: mail@domain.tld
        sender_name: user

Je cherche a réparer cette erreur j'ai chercher de moi même quelques heures mais je comprends toujours pas d'ou viens cette erreur..
Voici l'erreur que j'obtiens

Attempted to load class "User" from namespace "FosSf3\MainBundle\Entity".aroundDid you forget a "use" statement for e.g. "Symfony\Component\Security\Core\User\User", "Symfony\Bridge\Doctrine\Tests\Fixtures\User" or "FOS\UserBundle\Model\User"?

Dans l'attente d'une aide qui pourrait m'être très précieuse, je vous remerci.

Cordialement.