Fatal error: Uncaught Error: Class "yii\db\ActiveRecord" not found in /var/www/html/prod/vendor/kartik-v/yii2-tree-manager/src/models/Tree.php:75 Stack trace: #0 {main} thrown in /var/www/html/prod/vendor/kartik-v/yii2-tree-manager/src/models/Tree.php on line 75