Fatal error: Uncaught Error: Class 'yii\base\Event' not found in /home/mpolsk5/public_html/seocomo/craft/vendor/craftcms/cms/src/events/PluginEvent.php:19 Stack trace: #0 {main} thrown in /home/mpolsk5/public_html/seocomo/craft/vendor/craftcms/cms/src/events/PluginEvent.php on line 19