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Fatal error: Uncaught Error: Class 'Yii' not found in /var/www/html/autocar/vendor/kartik-v/yii2-tree-manager/src/views/_form.php:63 Stack trace: #0 {main} thrown in /var/www/html/autocar/vendor/kartik-v/yii2-tree-manager/src/views/_form.php on line 63