Fatal error: Uncaught Error: Class 'yii\base\Event' not found in /home/mpolsk5/public_html/seocomo/craft/vendor/craftcms/cms/src/events/DefineHtmlEvent.php:18
Stack trace:
#0 {main}
thrown in /home/mpolsk5/public_html/seocomo/craft/vendor/craftcms/cms/src/events/DefineHtmlEvent.php on line 18