Fatal error: Uncaught Error: Class "Twig_Extension" not found in /home/capacita/public_html/aula.certificateperu.com/src/Chamilo/ThemeBundle/Helper/WidgetHelper.php:11 Stack trace: #0 {main} thrown in /home/capacita/public_html/aula.certificateperu.com/src/Chamilo/ThemeBundle/Helper/WidgetHelper.php on line 11