Fatal error: Uncaught Error: Class 'Yii' not found in /var/www/html/ng-crm/yiiapp/backend/views/xml-export-formats/Zoopla_xml_export.php:8 Stack trace: #0 {main} thrown in /var/www/html/ng-crm/yiiapp/backend/views/xml-export-formats/Zoopla_xml_export.php on line 8