Fatal error: Uncaught Error: Class "PHPExcel_Exception" not found in C:\xampp\htdocs\crop_db\libs\phpoffice\PHPExcel\Calculation\Exception.php:36 Stack trace: #0 {main} thrown in C:\xampp\htdocs\crop_db\libs\phpoffice\PHPExcel\Calculation\Exception.php on line 36