Fatal error: Uncaught Error: Class 'yii\db\Migration' not found in /var/www/html/autocar/vendor/kotchuprik/yii2-sortable-widgets/migrations/Migration.php:7 Stack trace: #0 {main} thrown in /var/www/html/autocar/vendor/kotchuprik/yii2-sortable-widgets/migrations/Migration.php on line 7