为什么在 Symfony 4 中使用 Doctrine 时看不到命名空间

Symfony 4美好的一天，告诉我为了使用存储库需要修复什么doctrine？现在，当我尝试访问该页面时，出现以下错误：

在链配置的命名空间 App\Entity 中找不到类“App\Repository\PageModulesRepository”

存储库本身：

namespace App\Repository;

use App\Entity\PageModules;
use Doctrine\ORM\EntityRepository;
use Doctrine\Bundle\DoctrineBundle\Repository\ServiceEntityRepository;
use Symfony\Bridge\Doctrine\RegistryInterface;

class PageModulesRepository extends EntityRepository
{

    public function __construct()
    {

    }
}

控制器本身

namespace App\Controller;
use App\Repository\PageModulesRepository;
use Doctrine\Common\Annotations\AnnotationReader;
use Symfony\Component\HttpFoundation\JsonResponse;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\Routing\Annotation\Route;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;

use Symfony\Component\Serializer\Mapping\Factory\ClassMetadataFactory;
use Symfony\Component\Serializer\Mapping\Loader\AnnotationLoader;
use Symfony\Component\Serializer\Normalizer\ObjectNormalizer;
use Symfony\Component\Serializer\Serializer;
class ApiController extends Controller
{
    /**
     * @Route("/api", name="api")
     */
    public function index()
    {

        $do = $this->getDoctrine();
        $treeR = $do->getRepository(PageModulesRepository::class);

        return $this->json([
            'message' => 'Welcome to your new controller!',
            'path' => 'src/Controller/ApiController.php',
        ]);
    }
}

我怀疑问题可能出在此处：

教义配置：

parameters:
    # Adds a fallback DATABASE_URL if the env var is not set.
    # This allows you to run cache:warmup even if your
    # environment variables are not available yet.
    # You should not need to change this value.
    env(DATABASE_URL): ''

doctrine:
    dbal:
        # configure these for your database server
        driver: 'pdo_mysql'
        server_version: '5.7'
        charset: utf8mb4
        default_table_options:
            charset: utf8mb4
            collate: utf8mb4_unicode_ci

        url: '%env(resolve:DATABASE_URL)%'
    orm:
        auto_generate_proxy_classes: '%kernel.debug%'
        naming_strategy: doctrine.orm.naming_strategy.underscore
        auto_mapping: true
        mappings:
            App:
                is_bundle: false
                type: annotation
                dir: '%kernel.project_dir%/src/Entity'
                prefix: 'App\Entity'
                alias: App

我试图删除映射部分：在配置中然后它只是说

在链配置的命名空间中找不到类“App\Repository\PageModulesRepository”

告诉我如何解决？