Fatal error: Uncaught Error: Class 'yii\db\Migration' not found in /var/www/html/autocar/migrations/m200608_133154_add_order_to_all_tbls.php:9 Stack trace: #0 {main} thrown in /var/www/html/autocar/migrations/m200608_133154_add_order_to_all_tbls.php on line 9