Fatal error: Uncaught Error: Undefined constant "PHPEXCEL_ROOT" in /home/easysales/public_html/new_to_old_excel_gen/easysales/cms/PHPExcel/Shared/trend/exponentialBestFitClass.php:29 Stack trace: #0 {main} thrown in /home/easysales/public_html/new_to_old_excel_gen/easysales/cms/PHPExcel/Shared/trend/exponentialBestFitClass.php on line 29