Fatal error: Uncaught Error: Class "Symfony\Component\Templating\Helper\Helper" not found in C:\xampp\htdocs\bateriasec\vendor\symfony\templating\Helper\SlotsHelper.php:19 Stack trace: #0 {main} thrown in C:\xampp\htdocs\bateriasec\vendor\symfony\templating\Helper\SlotsHelper.php on line 19