Fatal error: Uncaught Error: Class "Symfony\Component\Form\AbstractType" not found in /home/capacita/public_html/aula.certificateperu.com/src/Chamilo/ThemeBundle/Form/FormDemoModelType.php:15 Stack trace: #0 {main} thrown in /home/capacita/public_html/aula.certificateperu.com/src/Chamilo/ThemeBundle/Form/FormDemoModelType.php on line 15