Fatal error: Uncaught Error: Class "yii\base\BaseObject" not found in /var/www/html/web/yii/basic/vendor/yiisoft/yii2/caching/MemCacheServer.php:21 Stack trace: #0 {main} thrown in /var/www/html/web/yii/basic/vendor/yiisoft/yii2/caching/MemCacheServer.php on line 21