Fatal error: Uncaught Error: Class "yii\db\ActiveRecord" not found in /home/leasingm/public_html/public_html/vendor/creocoder/yii2-nested-sets/tests/models/Tree.php:21 Stack trace: #0 {main} thrown in /home/leasingm/public_html/public_html/vendor/creocoder/yii2-nested-sets/tests/models/Tree.php on line 21