Repository usage in configureActionButtons (Sonata Admin Bundle)

Question

I am trying to inject doctrine service (if there is a way to inject BoothTypeRepository without Doctrine, that's also fine) into configureActionButtons and I can't find the way to inject nor doctrine or BoothTypeRepository.

public function configureActionButtons($action, $object = null): array
    {
        $list = parent::configureActionButtons($action, $object);;

        $handles = $this->getConfigurationPool()->getContainer()->get('doctrine.orm.entity_manager')->getRepository(BoothTypeRepository::class)->findAll();
        
        foreach($handles as $handle) {
            $list['new_' . $handle] = [
                'attr' => $handle,
                'template' => 'CRUD/button_new_booth_type.html.twig'
            ];
        }

        unset($list['new']);

        return $list;
    }

The Error which I got from the upper code

An exception has been thrown during the rendering of a template ("Class "App\Repository\BoothTypeRepository" sub class of "Doctrine\Bundle\DoctrineBundle\Repository\ServiceEntityRepository" is not a valid entity or mapped super class.").

This is the namespace for BoothTypeRepository ->

namespace App\Repository;