Fatal error: Uncaught Error: Call to a member function convertDate() on null in /home/byfzezt/www/app/Controllers/ArticleController.php:53 Stack trace: #0 /home/byfzezt/www/vendor/symfony/http-kernel/HttpKernel.php(151): Projet\Controllers\ArticleController->show(10) #1 /home/byfzezt/www/vendor/symfony/http-kernel/HttpKernel.php(68): Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object(Symfony\Component\HttpFoundation\Request), 1) #2 /home/byfzezt/www/vendor/silex/silex/src/Silex/Application.php(496): Symfony\Component\HttpKernel\HttpKernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #3 /home/byfzezt/www/vendor/silex/silex/src/Silex/Application.php(477): Silex\Application->handle(Object(Symfony\Component\HttpFoundation\Request)) #4 /home/byfzezt/www/index.php(105): Silex\Application->run() #5 {main} thrown in /home/byfzezt/www/app/Controllers/ArticleController.php on line 53