Fatal error: Uncaught Error: Class "yii\db\Migration" not found in /users/quirl/www/filemanager/spark/protected/runtime/module_backups/calendar_1742577949/migrations/m171027_185419_uid.php:12 Stack trace: #0 {main} thrown in /users/quirl/www/filemanager/spark/protected/runtime/module_backups/calendar_1742577949/migrations/m171027_185419_uid.php on line 12