Currently, I am updating the system running on the existing Symfony 2.3 (currently 3.0.9), and checking the operation. When I tried to change the state of an item to the selected state, I got an error. Do you have any advice for determining the case? Error Code Code ArticleController.php Version CentOS 6.7 PHP 5.6 Symfony3.0.9 Answer I’m guessing you are