Fatal error: Uncaught Error: Class 'yii\helpers\Html' not found in /opt/lampp/htdocs/c8skyrocket-stage-bak20250617/views/demo/index.php:12 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/c8skyrocket-stage-bak20250617/views/demo/index.php on line 12