Fatal error: Uncaught Error: Undefined constant "PHPEXCEL_ROOT" in E:\xampp\htdocs\SatCalculators\lib\PHPExcel-1.8\Classes\PHPExcel\Shared\trend\linearBestFitClass.php:3
Stack trace:
#0 {main}
thrown in E:\xampp\htdocs\SatCalculators\lib\PHPExcel-1.8\Classes\PHPExcel\Shared\trend\linearBestFitClass.php on line 3