Fatal error: Uncaught exception 'Symfony\Component\DependencyInjection\Exception\ServiceNotFoundException' with message 'You have requested a non-existent service "derky.sortablescaptcha.captcha.sortables".' in /forum/vendor/symfony/dependency-injection/Symfony/Component/DependencyInjection/ContainerBuilder.php:806 Stack trace: #0 /forum/vendor/symfony/dependency-injection/Symfony/Component/DependencyInjection/ContainerBuilder.php(444): Symfony\Component\DependencyInjection\ContainerBuilder->getDefinition('derky.sortables...') #1 /forum/phpbb/captcha/factory.php(48): Symfony\Component\DependencyInjection\ContainerBuilder->get('derky.sortables...') #2 /forum/posting.php(243): phpbb\captcha\factory->get_instance('derky.sortables...') #3 {main} thrown in /forum/vendor/symfony/dependency-injection/Symfony/Component/DependencyInjection/ContainerBuilder.php on line 806