[Insight] Deprecated class usage found - in Bundle/…/ExceptionController.php, line 40

[talbotseb]

in Bundle/TwigBundle/Controller/ExceptionController.php, line 40

The Symfony\Component\HttpKernel\Exception\FlattenException class has been deprecated in Symfony 2.3. Use the Symfony\Component\Debug\Exception\FlattenException class instead.

     *
     * @throws \InvalidArgumentException When the exception template does not exist
     *
     * @return Response
     */
    public function showAction(Request $request, FlattenException $exception, DebugLoggerInterface $logger = null, $_format = 'html')
    {
        $currentContent = $this->getAndCleanOutputBuffering($request->headers->get('X-Php-Ob-Level', -1));
        $code = $exception->getStatusCode();

        //get request extension

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