Fatal error: Uncaught Error: Class 'yii\db\Migration' not found in /home/abertime/new.abertime.com.ua/vendor/dmstr/yii2-db/db/migrations/m160609_090908_add_access_columns.php:5 Stack trace: #0 {main} thrown in /home/abertime/new.abertime.com.ua/vendor/dmstr/yii2-db/db/migrations/m160609_090908_add_access_columns.php on line 5