Fatal error: Uncaught Error: Class 'PhpOffice\PhpSpreadsheet\Worksheet\CellIterator' not found in C:\xampp\htdocs\ws-grifos-peruanos\PhpSpreadsheet\Worksheet\ColumnCellIterator.php:8 Stack trace: #0 {main} thrown in C:\xampp\htdocs\ws-grifos-peruanos\PhpSpreadsheet\Worksheet\ColumnCellIterator.php on line 8