Fatal error: Uncaught Error: Class "yii\db\Migration" not found in /users/quirl/www/filemanager/spark/protected/runtime/module_backups/legal_1742621236/migrations/m180511_135015_pages.php:10 Stack trace: #0 {main} thrown in /users/quirl/www/filemanager/spark/protected/runtime/module_backups/legal_1742621236/migrations/m180511_135015_pages.php on line 10