Fatal error: Uncaught Error: Class 'yii\helpers\Html' not found in /home/mpolsk5/public_html/seocomo/craft/vendor/craftcms/cms/src/helpers/Html.php:24 Stack trace: #0 {main} thrown in /home/mpolsk5/public_html/seocomo/craft/vendor/craftcms/cms/src/helpers/Html.php on line 24