Fatal error: Uncaught Error: Class "yii\web\MultiFieldSession" not found in /var/www/html/web/yii/basic/vendor/yiisoft/yii2/web/DbSession.php:41 Stack trace: #0 {main} thrown in /var/www/html/web/yii/basic/vendor/yiisoft/yii2/web/DbSession.php on line 41