Fatal error: Uncaught Error: Undefined constant "PHPEXCEL_ROOT" in C:\xampp\htdocs\BK\bateriasec\vendor\phpoffice\phpexcel\Classes\PHPExcel\Shared\trend\linearBestFitClass.php:3 Stack trace: #0 {main} thrown in C:\xampp\htdocs\BK\bateriasec\vendor\phpoffice\phpexcel\Classes\PHPExcel\Shared\trend\linearBestFitClass.php on line 3