Fatal error: Uncaught Error: Interface 'Symfony\Contracts\Service\ServiceSubscriberInterface' not found in E:\xampp\htdocs\www\key\vendor\symfony\translation\Tests\DependencyInjection\fixtures\ServiceSubscriber.php:9 Stack trace: #0 {main} thrown in E:\xampp\htdocs\www\key\vendor\symfony\translation\Tests\DependencyInjection\fixtures\ServiceSubscriber.php on line 9