Fatal error: Uncaught Error: Class "yii\db\Migration" not found in /users/quirl/www/filemanager/spark/protected/runtime/module_backups/custom_pages_1742577933/migrations/m160719_131212_init_templates.php:6 Stack trace: #0 {main} thrown in /users/quirl/www/filemanager/spark/protected/runtime/module_backups/custom_pages_1742577933/migrations/m160719_131212_init_templates.php on line 6