Fatal error: Uncaught Error: Class 'yii\db\ActiveQuery' not found in /var/www/html/autocar/vendor/creocoder/yii2-nested-sets/tests/models/MultipleTreeQuery.php:15 Stack trace: #0 {main} thrown in /var/www/html/autocar/vendor/creocoder/yii2-nested-sets/tests/models/MultipleTreeQuery.php on line 15