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Fatal error: Uncaught Error: Class 'Yii' not found in /var/www/html/ng-crm/yiiapp/backend/views/xml-export-formats/xml_export.php:12 Stack trace: #0 {main} thrown in /var/www/html/ng-crm/yiiapp/backend/views/xml-export-formats/xml_export.php on line 12