Argument 1 passed to EasyCorp\Bundle\EasyAdminBundle\Router\AdminUrlGenerator::setController() must be of the type string, null given

I have one problem in my application with symfony. I want generate URL on my Admin Back office for get to 'index' in my Order after the change a state of my order but I have this error:

Argument 1 passed to EasyCorp\Bundle\EasyAdminBundle\Router\AdminUrlGenerator::setController() must be of the type string, null given

I use Easyadmin v3.5

Below, my OrderCrudController:

<?php

namespace App\Controller\Admin;

use App\Controller\OrderController;
use App\Entity\Order;
use Doctrine\ORM\EntityManagerInterface;
use EasyCorp\Bundle\EasyAdminBundle\Config\Action;
use EasyCorp\Bundle\EasyAdminBundle\Config\Actions;
use EasyCorp\Bundle\EasyAdminBundle\Config\Crud;
use EasyCorp\Bundle\EasyAdminBundle\Context\AdminContext;
use EasyCorp\Bundle\EasyAdminBundle\Controller\AbstractCrudController;
use EasyCorp\Bundle\EasyAdminBundle\Field\ArrayField;
use EasyCorp\Bundle\EasyAdminBundle\Field\ChoiceField;
use EasyCorp\Bundle\EasyAdminBundle\Field\DateTimeField;
use EasyCorp\Bundle\EasyAdminBundle\Field\IdField;
use EasyCorp\Bundle\EasyAdminBundle\Field\MoneyField;
use EasyCorp\Bundle\EasyAdminBundle\Field\TextField;
use EasyCorp\Bundle\EasyAdminBundle\Router\AdminUrlGenerator;

class OrderCrudController extends AbstractCrudController
{
    private $entityManager;
    private $crudUrlGenerator;

    public function __construct(EntityManagerInterface $entityManager, AdminUrlGenerator $crudUrlGenerator)
    {
        $this->entityManager = $entityManager;
        $this->crudUrlGenerator = $crudUrlGenerator;
    }

    public static function getEntityFqcn(): string
    {
        return Order::class;
    }

    public function configureActions(Actions $actions): Actions
    {
        $updatePreparation = Action::new('updatePreparation', 'Préparation en cours')->linkToCrudAction('updatePreparation');
        $updateDelivery = Action::new('updateDelivery', 'Livraison en cours','fas fa-truck')->linkToCrudAction('updateDelivery');

        return $actions
            ->add('detail', $updatePreparation)
            ->add('detail', $updateDelivery)
            ->add('index','detail');
    }

    public function updatePreparation(AdminContext $context)
    {
        $order = $context->getEntity()->getInstance();
        $order->setState(2);
        $this->entityManager->flush();

        $this->addFlash('notice',"<span style='color:green;'><strong>La commande".$order->getReference()."est bien <u>en cours de préparation</u></strong></span>");

        $url= $this->crudUrlGenerator->build()
            ->setController(OrderCrudController::class)
            ->setAction('index')
            ->generateUrl();

        return $this->redirect($url);
    }

    public function updateDelivery(AdminContext $context)
    {
        $order = $context->getEntity()->getInstance();
        $order->setState(3);
        $this->entityManager->flush();

        $this->addFlash('notice',"<span style='color:orange;'><strong>La commande".$order->getReference()."est bien <u>en cours de livraison</u></strong></span>");

        $url= $this->crudUrlGenerator->build()
            ->setController(OrderCrudController::class)
            ->setAction('index')
            ->generateUrl();

        return $this->redirect($url);
    }

    public function configureCrud(Crud $crud): Crud
    {
       return $crud->setDefaultSort(['id' => 'DESC']);
    }

    public function configureFields(string $pageName): iterable
    {
        return [
            IdField::new('id'),
            DateTimeField::new('createdAt','Passé le'),
            TextField::new('user.getFullname','Client'),
            MoneyField::new('total')->setCurrency('EUR'),
            MoneyField::new('carrier.price', 'Frais de port')->setCurrency('EUR'),
            ChoiceField::new('state', 'Etat')->setChoices([
                'Non payée'=> 0,
                'Payée' => 1,
                'Préparation en cours' => 2,
                'Livraison en cours'=> 3
            ]),
            ArrayField::new('orderDetails', 'Produits achetés')->hideOnIndex()
        ];
    }

}

Thank you for your help.