Fatal error: Uncaught Error: Class "yii\helpers\Html" not found in /home/apolo/public_html/sgdpr/vendor/yiisoft/yii2-bootstrap/src/BaseHtml.php:20 Stack trace: #0 {main} thrown in /home/apolo/public_html/sgdpr/vendor/yiisoft/yii2-bootstrap/src/BaseHtml.php on line 20