Мне нужно настроить ошибки, поэтому не могу прочитать синтаксическую ошибку в symfony классе события kernel.exception в symfony 4.1

Question

class ExceptionListener
{

    public function onKernelException(GetResponseForExceptionEvent $event)
    {
        $exception = $event->getException();
        $details = "Error: ".$exception->getMessage()."<br/> Line No:".$exception->getLine()."<br/> File Path: ".$exception->getFile();
        $message = $details;

        // Customize your response object to display the exception details
        $response = new Response();
        $response->setContent($message);



        // HttpExceptionInterface is a special type of exception that
        // holds status code and header details
        if ($exception instanceof HttpExceptionInterface) {
            $response->setStatusCode($exception->getStatusCode());
            $response->headers->replace($exception->getHeaders());
        } else {
            $response->setStatusCode(Response::HTTP_INTERNAL_SERVER_ERROR);
        }

        // sends the modified response object to the event
        $event->setResponse($response);
    }
}


 App\EventListener\ExceptionListener:
        tags:
            - { name: kernel.event_listener, event: kernel.exception, priority: 200 }