Получение ошибки «Попытка загрузить класс «LiipImagineBundle» из пространства имен «Liip\ImagineBundle». При настройке Liip в Symfony 4

Я пытаюсь настроить Liip для Symfony 4, вот страницы документации:

https://github.com/liip/LiipImagineBundle

https://symfony.com/doc/master/bundles/LiipImagineBundle/installation.html

Я уже запускал команду composer require liip/imagine-bundle, вот как выглядит мой файл liip.yml:

liip_imagine :

# configure resolvers
resolvers :
    # setup the default resolver
    default :
        # use the default web path
        web_path : ~
# your filter sets are defined here
filter_sets :
    # use the default cache configuration
    cache : ~
    # the name of the "filter set"
    my_thumb :
        # adjust the image quality to 75%
        quality : 75
        # list of transformations to apply (the "filters")
        filters :
            # create a thumbnail: set size to 120x90 and use the "outbound" mode
            # to crop the image when the size ratio of the input differs
            thumbnail  : { size : [120, 90], mode : outbound }
            # create a 2px black border: center the thumbnail on a black background
            # 4px larger to create a 2px border around the final image
            background : { size : [124, 94], position : center, color : '#000000' }

У меня есть файл config\routes\imagine.yml, который выглядит так:

_liip_imagine:
    resource: "@LiipImagineBundle/Resources/config/routing.xml"

Вот мой файл \config\bundles.php:

< ?php

возвращение [ Symfony\Bundle\FrameworkBundle\FrameworkBundle::class => ['all' => true], Doctrine\Bundle\DoctrineCacheBundle\DoctrineCacheBundle::class => ['all' => true], Sensio\Bundle\FrameworkExtraBundle\SensioFrameworkExtraBundle::class => ['all' => true], Doctrine\Bundle\DoctrineBundle\DoctrineBundle::class => ['all' => true], Doctrine\Bundle\MigrationsBundle\DoctrineMigrationsBundle::class => ['all' => true], Symfony\Bundle\SecurityBundle\SecurityBundle::class => ['all' => true], Symfony\Bundle\SwiftmailerBundle\SwiftmailerBundle::class => ['all' => true], Symfony\Bundle\WebProfilerBundle\WebProfilerBundle::class => ['dev' => true, 'test' => true], Symfony\Bundle\TwigBundle\TwigBundle::class => ['all' => true], Symfony\Bundle\MonologBundle\MonologBundle::class => ['all' => true], Symfony\Bundle\DebugBundle\DebugBundle::class => ['dev' => true, 'test' => true], Symfony\Bundle\WebServerBundle\WebServerBundle::class => ['dev' => true], Symfony\Bundle\MakerBundle\MakerBundle::class => ['dev' => true], Doctrine\Bundle\FixturesBundle\DoctrineFixturesBundle::class => ['dev' => true, 'test' => true], Aws\Symfony\AwsBundle::class => ['all' => true], Knp\Bundle\PaginatorBundle\KnpPaginatorBundle::class => ['all' => true], FOS\JsRoutingBundle\FOSJsRoutingBundle::class => ['all' => true], ];

Я попытался поместить Liip\ImagineBundle\LiipImagineBundle::class => ['all' => true] в свой файл bundles.php, но это не сработало.

Может ли кто-нибудь сказать мне, что мне не хватает?