Symfony 4: Cannot declare class xxxKernel, because the name is already in use

actually Iam working on a symfony update from 3.4 to 4.4. Many things are done but when I try to debug my services I got this:

php bin/console debug:autowiring

PHP Fatal error: Cannot declare class xxxKernel, because the name is
already in use in /app/src/kernel.php on line 12

Could this related to my upgrade? Other commands, like debug:router works fine!

src/Kernel.php

<?php

namespace xxx;

use SymfonyBundleFrameworkBundleKernelMicroKernelTrait;
use SymfonyComponentConfigLoaderLoaderInterface;
use SymfonyComponentConfigResourceFileResource;
use SymfonyComponentDependencyInjectionContainerBuilder;
use SymfonyComponentHttpKernelKernel as BaseKernel;
use SymfonyComponentRoutingRouteCollectionBuilder;

class Kernel extends BaseKernel
{
    use MicroKernelTrait;

    private const CONFIG_EXTS = '.{php,xml,yaml,yml}';

    public function registerBundles(): iterable
    {
        $contents = require $this->getProjectDir().'/config/bundles.php';
        foreach ($contents as $class => $envs) {
            if ($envs[$this->environment] ?? $envs['all'] ?? false) {
                yield new $class();
            }
        }
    }

    public function getProjectDir(): string
    {
        return dirname(__DIR__);
    }

    protected function configureContainer(ContainerBuilder $container, LoaderInterface $loader): void
    {
        $container->addResource(new FileResource($this->getProjectDir().'/config/bundles.php'));
        $container->setParameter('container.dumper.inline_class_loader', PHP_VERSION_ID < 70400 || $this->debug);
        $container->setParameter('container.dumper.inline_factories', true);
        $confDir = $this->getProjectDir().'/config';

        $loader->load($confDir.'/{packages}/*'.self::CONFIG_EXTS, 'glob');
        $loader->load($confDir.'/{packages}/'.$this->environment.'/*'.self::CONFIG_EXTS, 'glob');
        $loader->load($confDir.'/{services}'.self::CONFIG_EXTS, 'glob');
        $loader->load($confDir.'/{services}_'.$this->environment.self::CONFIG_EXTS, 'glob');
    }

    protected function configureRoutes(RouteCollectionBuilder $routes): void
    {
        $confDir = $this->getProjectDir().'/config';

        $routes->import($confDir.'/{routes}/'.$this->environment.'/*'.self::CONFIG_EXTS, '/', 'glob');
        $routes->import($confDir.'/{routes}/*'.self::CONFIG_EXTS, '/', 'glob');
        $routes->import($confDir.'/{routes}'.self::CONFIG_EXTS, '/', 'glob');
    }
}

Source: Symfony Questions

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