Fatal error: Uncaught Error: Class "yii\db\Migration" not found in /users/quirl/www/filemanager/spark/protected/runtime/module_backups/custom_pages_1742577939/migrations/m220928_093550_add_iframe_attrs_column.php:8 Stack trace: #0 {main} thrown in /users/quirl/www/filemanager/spark/protected/runtime/module_backups/custom_pages_1742577939/migrations/m220928_093550_add_iframe_attrs_column.php on line 8