Fatal error: Uncaught Error: Undefined constant "PHPEXCEL_ROOT" in /home/apolo/public_html/sgdpr/vendor/phpoffice/phpexcel/Classes/PHPExcel/Shared/trend/polynomialBestFitClass.php:3
Stack trace:
#0 {main}
thrown in /home/apolo/public_html/sgdpr/vendor/phpoffice/phpexcel/Classes/PHPExcel/Shared/trend/polynomialBestFitClass.php on line 3