how to use JMS Serializer – Symfony Questions

I trying to use the bundle JMS Serializer in symfony v4.20.5.
I had install the package composer require jms/serializer-bundle.
I added the bundle in file config/bundles.php JMSSerializerBundleJMSSerializerBundle::class=> ['all' => true],.
Now in my _construct method of my Controller i did thhat:

<?php

namespace AppController;

use AppTraitsProjectTrait;
use DoctrineORMEntityManagerInterface;
use JMSSerializerSerializer;
use SymfonyBundleFrameworkBundleControllerAbstractController;
use SymfonyComponentHttpFoundationResponse;
use SymfonyContractsEventDispatcherEventDispatcherInterface;

class BaseController extends AbstractController
{

    use ProjectTrait;

    /**
     * @var EventDispatcherInterface
     */
    protected $eventDispatcher;

    /**
     * @var EntityManagerInterface
     */
    protected $em;

    /**
     * @var Serializer|object
     */
    protected $serializer;

    /**
     * BaseController constructor.
     * @param EventDispatcherInterface $eventDispatcher
     * @param EntityManagerInterface $em
     */
    public function __construct(EventDispatcherInterface $eventDispatcher, EntityManagerInterface $em)
    {
        $this->eventDispatcher = $eventDispatcher;
        $this->em = $em;
        $this->serializer = $this->get('jms_serializer');
    }

    public function index(): Response{
        return $this->render('dashboards/default_dashboard.html.twig');
    }
}

But in my navigator i get that : Call to a member function get() on null
This error refers to the get function of AbstractContainer :

    protected function get(string $id): object
    {
        return $this->container->get($id);
    }

I can not correct this error. thank you for helping me.

Source: Symfony Questions

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