Fatal error: Uncaught Error: Class 'PHPExcel_Writer_Excel5_BIFFwriter' not found in C:\Apache24\htdocs\afnic\vendor\PHPExcel\Writer\Excel5\Worksheet.php:63 Stack trace: #0 {main} thrown in C:\Apache24\htdocs\afnic\vendor\PHPExcel\Writer\Excel5\Worksheet.php on line 63