Fatal error: Uncaught Error: Undefined constant "PHPEXCEL_ROOT" in C:\laragon\www\siesicis\vendor\phpoffice\phpexcel\Classes\PHPExcel\Autoloader.php:77
Stack trace:
#0 C:\laragon\www\siesicis\vendor\phpoffice\phpexcel\Classes\PHPExcel\Autoloader.php(36): PHPExcel_Autoloader::Load('PHPExcel_Shared...')
#1 {main}
thrown in C:\laragon\www\siesicis\vendor\phpoffice\phpexcel\Classes\PHPExcel\Autoloader.php on line 77