Fatal error: Uncaught Error: Class 'craft\db\Migration' not found in /home/mpolsk5/public_html/seocomo/craft/vendor/craftcms/cms/src/migrations/m210611_233510_default_placement_settings.php:13 Stack trace: #0 {main} thrown in /home/mpolsk5/public_html/seocomo/craft/vendor/craftcms/cms/src/migrations/m210611_233510_default_placement_settings.php on line 13