Fatal error: Uncaught Error: Class 'PHPExcel_Worksheet_CellIterator' not found in D:\xampp\htdocs\GM\Classes\PHPExcel\Worksheet\ColumnCellIterator.php:28 Stack trace: #0 {main} thrown in D:\xampp\htdocs\GM\Classes\PHPExcel\Worksheet\ColumnCellIterator.php on line 28