The class AnimeDb\Bundle\CatalogBundle\Plugin\Fill\Filler\Chain is declared but never used. You should remove the use statement.
use AnimeDb\Bundle\CatalogBundle\Form\Type\Plugin\Search as SearchFrom;
use AnimeDb\Bundle\CatalogBundle\Form\Type\Plugin\SearchFiller as SearchFillerForm;
use AnimeDb\Bundle\CatalogBundle\Entity\SearchFiller;
use AnimeDb\Bundle\CatalogBundle\Entity\Item;
use AnimeDb\Bundle\CatalogBundle\Plugin\Chain;
use AnimeDb\Bundle\CatalogBundle\Plugin\Fill\Filler\Chain as ChainFiller;
use AnimeDb\Bundle\CatalogBundle\Plugin\Fill\Search\Chain as ChainSearch;
use AnimeDb\Bundle\CatalogBundle\Plugin\Fill\Filler\FillerInterface;
use AnimeDb\Bundle\CatalogBundle\Plugin\Fill\Search\SearchInterface;
use AnimeDb\Bundle\CatalogBundle\Plugin\PluginInterface;
use Symfony\Component\HttpFoundation\Response;
in src/Controller/FillController.php, line 19
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