Undefined method getException() on RequestEvent class

I came across this error while trying to access http://api.codelytv.localhost:8030/

Attempted to call an undefined method named "getException" of class "Symfony\Component\HttpKernel\Event\ExceptionEvent".

To make it work, I changed a few things in this class:

I used the ExceptionEvent class instead of RequestEvent in the method signature of onException() and changed the getException() call by getThrowable().
I used \Throwable in the method signature of exceptionCodeFor() instead of Exception.
I replaced class_basename() by get_class inside this same method

which results in the following:

final class ApiExceptionListener
{
    private ApiExceptionsHttpStatusCodeMapping $exceptionHandler;

    public function __construct(ApiExceptionsHttpStatusCodeMapping $exceptionHandler)
    {
        $this->exceptionHandler = $exceptionHandler;
    }

    public function onException(ExceptionEvent $event): void
    {
        $exception = $event->getThrowable();

        $event->setResponse(
            new JsonResponse(
                [
                    'code'    => $this->exceptionCodeFor($exception),
                    'message' => $exception->getMessage(),
                ],
                $this->exceptionHandler->statusCodeFor(get_class($exception))
            )
        );
    }

    private function exceptionCodeFor(\Throwable $error): string
    {
        $domainErrorClass = DomainError::class;

        return $error instanceof $domainErrorClass ? $error->errorCode() : Utils::toSnakeCase(get_class($error));
    }
}

These are not optimal changes by any means, but they allowed me to display a fully functionnal error message on the homepage.

CodelyTV / php-ddd-example

Undefined method getException() on RequestEvent class #147