Fatal error: Uncaught Error: Undefined constant "PHPEXCEL_ROOT" in C:\Apache24\htdocs\web\8.1\xxx_Erp_Fbn_Beta_Cen_02\xxx_PHPExcel-1.8\Classes\PHPExcel\Autoloader.php:70 Stack trace: #0 C:\Apache24\htdocs\web\8.1\xxx_Erp_Fbn_Beta_Cen_02\xxx_PHPExcel-1.8\Classes\PHPExcel\Autoloader.php(11): PHPExcel_Autoloader::load('PHPExcel_Shared...') #1 {main} thrown in C:\Apache24\htdocs\web\8.1\xxx_Erp_Fbn_Beta_Cen_02\xxx_PHPExcel-1.8\Classes\PHPExcel\Autoloader.php on line 70