Fatal error: Uncaught Error: Class 'yii\db\Migration' not found in /home/abertime/new.abertime.com.ua/vendor/dmstr/yii2-db/db/RbacMigration.php:71 Stack trace: #0 {main} thrown in /home/abertime/new.abertime.com.ua/vendor/dmstr/yii2-db/db/RbacMigration.php on line 71