Fatal error: Uncaught Error: Class 'Symfony\Component\Templating\Helper\Helper' not found in D:\workspaces\liZiPingBack\vendor\symfony\framework-bundle\Templating\Helper\RequestHelper.php:27 Stack trace: #0 {main} thrown in D:\workspaces\liZiPingBack\vendor\symfony\framework-bundle\Templating\Helper\RequestHelper.php on line 27