Fatal error: Uncaught Error: Class 'yii\db\Migration' not found in /var/www/html/autocar/vendor/yiisoft/yii2/rbac/migrations/m200409_110543_rbac_update_mssql_trigger.php:21 Stack trace: #0 {main} thrown in /var/www/html/autocar/vendor/yiisoft/yii2/rbac/migrations/m200409_110543_rbac_update_mssql_trigger.php on line 21