Fatal error: Uncaught Error: Class "yii\web\Session" not found in /var/www/html/web/yii/basic/vendor/yiisoft/yii2/web/MultiFieldSession.php:30 Stack trace: #0 {main} thrown in /var/www/html/web/yii/basic/vendor/yiisoft/yii2/web/MultiFieldSession.php on line 30