Fatal error: Uncaught Error: Class "PhpOffice\PhpSpreadsheet\Writer\Xls\BIFFwriter" not found in E:\www\frey\qgmvc\v1.0\composer\vendor\phpoffice\phpspreadsheet\src\PhpSpreadsheet\Writer\Xls\Worksheet.php:55 Stack trace: #0 {main} thrown in E:\www\frey\qgmvc\v1.0\composer\vendor\phpoffice\phpspreadsheet\src\PhpSpreadsheet\Writer\Xls\Worksheet.php on line 55