Fatal error: Uncaught Error: Class 'yii\helpers\Html' not found in /var/www/html/autocar/vendor/yiisoft/yii2-bootstrap4/src/BaseHtml.php:19 Stack trace: #0 {main} thrown in /var/www/html/autocar/vendor/yiisoft/yii2-bootstrap4/src/BaseHtml.php on line 19