Fatal error: Uncaught Error: Undefined constant "PHPEXCEL_ROOT" in E:\www\ypmvc\3.0\mvc\composer\vendor\phpoffice\phpexcel\Classes\PHPExcel\Shared\trend\logarithmicBestFitClass.php:3 Stack trace: #0 {main} thrown in E:\www\ypmvc\3.0\mvc\composer\vendor\phpoffice\phpexcel\Classes\PHPExcel\Shared\trend\logarithmicBestFitClass.php on line 3