Fatal error: Uncaught Error: Undefined constant "PHPEXCEL_ROOT" in D:\laragon\laragon\www\old\1 sept titulo\titulo_2\plugins\PHPExcel\Shared\trend\polynomialBestFitClass.php:29 Stack trace: #0 {main} thrown in D:\laragon\laragon\www\old\1 sept titulo\titulo_2\plugins\PHPExcel\Shared\trend\polynomialBestFitClass.php on line 29