Fatal error: Uncaught Error: Class "yii\helpers\Html" not found in /users/quirl/www/filemanager/spark/protected/runtime/module_backups/calendar_1742577949/widgets/views/participantItem.php:19 Stack trace: #0 {main} thrown in /users/quirl/www/filemanager/spark/protected/runtime/module_backups/calendar_1742577949/widgets/views/participantItem.php on line 19