Поправил название extansin

src/DependencyInjection/Data2DTODoctrineEntityExtension.php

@@ -7,7 +7,7 @@ use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Extension\Extension;
 use Symfony\Component\DependencyInjection\Loader\YamlFileLoader;
 
-class RequestExtension extends Extension
+class Data2DTODoctrineEntityExtension extends Extension
 {
     public function load(array $configs, ContainerBuilder $container)
     {