Class Doctrine\Common\Persistence\ObjectManager does not exist

Question

hi guys so im working in some symfony project and this error still display to me i have changed the Doctrine\Common\Persistence\ObjectManager to Doctrine\ORM\EntityManagerInterface; and still not working please i need some help it's for my university exams i tried alot to fix this issues even i look it up to stackoerflow about a solution but i didn't find anything can help

    <?php

namespace App\Controller;

use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\Routing\Annotation\Route;
use App\Entity\Article;
use App\Repository\ArticleRepository;
use Symfony\Component\HttpFoundation\Request;
use Doctrine\Common\Persistence\ObjectManager;
class BlogController extends AbstractController
{
/**
 * @Route("/blog", name="blog")
 */
public function index(ArticleRepository $repo): Response
{
   // $repo = $this->getDoctrine()->getRepository(Article::class);
    $articles = $repo->findAll();

    return $this->render('blog/index.html.twig', [
        'controller_name' => 'BlogController',
        'articles' => $articles
    ]);
}
/**
 * @Route("/",name="home")
 */
public function home(){
    return $this->render("blog/home.html.twig",[
        "title"=> "miral",
        "age" => 31
    ]);
}

   /**
 * @Route("/blog/new", name="blog_create")
 */
public function create(Request $request, ObjectManager $manager){
    dump($request);
    if($request->request->count() > 0){
        $article = new Article();
        $article->setTitle($request->request->get('title'))
        ->setContent($request->request->get('content'))
        ->setImage($request->request->get('image'));
        $manager->persist($article);
        $manager->flush();
    }
    return $this->render("blog/create.html.twig");

}

/**
 * @Route("/blog/{id}",name="blog_show")
 */
//ArticleRepository $repo, $id
public function show(Article $article){
    //$repo=$this->getDoctrine()->getRepository(Article::class);
   // $article= $repo->find($id);
    return $this->render("blog/show.html.twig",[
        'article' => $article
    ]);
}

}

Answer 1

There are no classes related to persistence in the Doctrine\Common namespace. So you have to use i.e. Doctrine\DBAL.