Fatal error: Uncaught Error: Undefined constant "PHPEXCEL_ROOT" in G:\70web\php\PEAR\PHPExcel\Autoloader.php:73 Stack trace: #0 G:\70web\php\PEAR\PHPExcel\Autoloader.php(36): PHPExcel_Autoloader::Load() #1 {main} thrown in G:\70web\php\PEAR\PHPExcel\Autoloader.php on line 73