ClassNotFoundException：尝试从命名空间“FOS \ UserBundle”加载类“FOSUserBundle”

（在Windows 10上使用WampServer . ）

我按照官方文档，在Symfony上安装Sonata User Bundle .

我收到以下错误消息

（1/1）ClassNotFoundException尝试从命名空间“FOS \ UserBundle”加载类“FOSUserBundle” . 您是否忘记了另一个命名空间的“use”语句？

AppKernel.php

<?php

use Symfony\Component\HttpKernel\Kernel;
use Symfony\Component\Config\Loader\LoaderInterface;

class AppKernel extends Kernel
{
    public function registerBundles()
    {
        $bundles = [
            new Symfony\Bundle\FrameworkBundle\FrameworkBundle(),
            new Symfony\Bundle\SecurityBundle\SecurityBundle(),
            new Symfony\Bundle\TwigBundle\TwigBundle(),
            new Symfony\Bundle\MonologBundle\MonologBundle(),
            new Symfony\Bundle\SwiftmailerBundle\SwiftmailerBundle(),
            new Doctrine\Bundle\DoctrineBundle\DoctrineBundle(),
            new Sensio\Bundle\FrameworkExtraBundle\SensioFrameworkExtraBundle(),
            new AppBundle\AppBundle(),

            new Sonata\CoreBundle\SonataCoreBundle(),

            //Added following https://sonata-project.org/bundles/admin/3-x/doc/getting_started/installation.html
            new Sonata\BlockBundle\SonataBlockBundle(),
            new Knp\Bundle\MenuBundle\KnpMenuBundle(),
            new Sonata\DoctrineORMAdminBundle\SonataDoctrineORMAdminBundle(),
            new Sonata\AdminBundle\SonataAdminBundle(),

            //Added following https://sonata-project.org/bundles/easy-extends/2-x/doc/reference/installation.html
            new Sonata\EasyExtendsBundle\SonataEasyExtendsBundle(),

            //Added following https://sonata-project.org/bundles/user/3-x/doc/reference/installation.html
            new FOS\UserBundle\FOSUserBundle(),
            new Sonata\UserBundle\SonataUserBundle('FOSUserBundle'),


        ];

        if (in_array($this->getEnvironment(), ['dev', 'test'], true)) {
            $bundles[] = new Symfony\Bundle\DebugBundle\DebugBundle();
            $bundles[] = new Symfony\Bundle\WebProfilerBundle\WebProfilerBundle();
            $bundles[] = new Sensio\Bundle\DistributionBundle\SensioDistributionBundle();

            if ('dev' === $this->getEnvironment()) {
                $bundles[] = new Sensio\Bundle\GeneratorBundle\SensioGeneratorBundle();
                $bundles[] = new Symfony\Bundle\WebServerBundle\WebServerBundle();
            }
        }

        return $bundles;
    }

    public function getRootDir()
    {
        return __DIR__;
    }

    public function getCacheDir()
    {
        return dirname(__DIR__).'/var/cache/'.$this->getEnvironment();
    }

    public function getLogDir()
    {
        return dirname(__DIR__).'/var/logs';
    }

    public function registerContainerConfiguration(LoaderInterface $loader)
    {
        $loader->load($this->getRootDir().'/config/config_'.$this->getEnvironment().'.yml');
    }
}

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%'
        types:
            json: Sonata\Doctrine\Types\JsonType

    orm:
        auto_generate_proxy_classes: '%kernel.debug%'
        naming_strategy: doctrine.orm.naming_strategy.underscore
        auto_mapping: true
        entity_managers:
            default:
                mappings:
                    ApplicationSonataUserBundle: ~
                    SonataUserBundle: ~
                    FOSUserBundle: ~                                    # If SonataUserBundle extends it

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

#Sonata
sonata_core:
    form_type: horizontal

sonata_user:
    security_acl: true
    manager_type: orm # can be orm or mongodb

sonata_block:
    default_contexts: [cms]
    blocks:
        # enable the SonataAdminBundle block
        sonata.admin.block.admin_list:
            contexts: [admin]
        #...
        sonata.user.block.menu:    # used to display the menu in profile pages
        sonata.user.block.account: # used to display menu option (login option)
        sonata.block.service.text: # used to if you plan to use Sonata user routes

#FOSUser
fos_user:
    db_driver:      orm # can be orm or odm
    firewall_name:  main
    user_class:     Sonata\UserBundle\Entity\BaseUser

    group:
        group_class:   Sonata\UserBundle\Entity\BaseGroup
        group_manager: sonata.user.orm.group_manager                    # If you're using doctrine orm (use sonata.user.mongodb.group_manager for mongodb)

    service:
        user_manager: sonata.user.orm.user_manager                      # If you're using doctrine orm (use sonata.user.mongodb.user_manager for mongodb)

routing.yml

login_view:
    path:     '/login/'
    defaults: { _controller: AppBundle:Login:view }

singlesingon_view:
    path:     '/authentication/singlesignon/'
    defaults: { _controller: AppBundle:AuthenticationSingleSignOn:view }

singlesingout_view:
    path:     '/authentication/singlesignout/'
    defaults: { _controller: AppBundle:AuthenticationSingleSignOut:view }    

app:
    resource: '@AppBundle/Controller/'
    type: annotation

admin_area:
    resource: "@SonataAdminBundle/Resources/config/routing/sonata_admin.xml"
    prefix: /admin

sonata_user_admin_security:
    resource: '@SonataUserBundle/Resources/config/routing/admin_security.xml'
    prefix: /admin

sonata_user_admin_resetting:
    resource: '@SonataUserBundle/Resources/config/routing/admin_resetting.xml'
    prefix: /admin/resetting

当我到达步骤2.5，开始运行

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

我明白了

致命错误：找不到类'FOS \ UserBundle \ FOSUserBundle' .

根据评论中的要求：composer.json的autoload部分

"autoload": {
    "psr-4": {
        "AppBundle\\": "src/AppBundle"
    },
    "classmap": [ "app/AppKernel.php", "app/AppCache.php" ]
},