Fatal error: Uncaught Error: Class "yii\helpers\Html" not found in /home2/yiikharazmisabt/public_html/vendor/yiisoft/yii2-bootstrap4/src/BaseHtml.php:19 Stack trace: #0 {main} thrown in /home2/yiikharazmisabt/public_html/vendor/yiisoft/yii2-bootstrap4/src/BaseHtml.php on line 19