Fatal error: Uncaught Error: Class "yii\db\ActiveRecord" not found in /home/iscaljorge/devsaftXplore_in/vendor/creocoder/yii2-nested-sets/tests/models/MultipleTree.php:22 Stack trace: #0 {main} thrown in /home/iscaljorge/devsaftXplore_in/vendor/creocoder/yii2-nested-sets/tests/models/MultipleTree.php on line 22