Fatal error: Uncaught Error: Class 'Twig_Extension' not found in C:\xampp\htdocs\Egresados\upload\twig\extensions\HelloWorld_Twig_Extension\HelloWorld_Twig_Extension.php:26 Stack trace: #0 {main} thrown in C:\xampp\htdocs\Egresados\upload\twig\extensions\HelloWorld_Twig_Extension\HelloWorld_Twig_Extension.php on line 26