Fatal error: Uncaught Error: Undefined constant "PHPEXCEL_ROOT" in D:\HTTP\htdocs\gincludes\PHPExcel-develop\Classes\PHPExcel\Autoloader.php:77 Stack trace: #0 D:\HTTP\htdocs\gincludes\PHPExcel-develop\Classes\PHPExcel\Autoloader.php(36): PHPExcel_Autoloader::Load('PHPExcel_Shared...') #1 {main} thrown in D:\HTTP\htdocs\gincludes\PHPExcel-develop\Classes\PHPExcel\Autoloader.php on line 77