Fatal error: Uncaught Error: Undefined constant "PHPEXCEL_ROOT" in C:\web\xampp02\htdocs\EasyTec\excel01\Classes\PHPExcel\Shared\trend\trendClass.php:3 Stack trace: #0 {main} thrown in C:\web\xampp02\htdocs\EasyTec\excel01\Classes\PHPExcel\Shared\trend\trendClass.php on line 3