Fatal error: Uncaught Error: Class "PhpOffice\PhpSpreadsheet\Writer\Xlsx\WriterPart" not found in D:\HTTP\htdocs\gincludes\vendor\phpoffice\phpspreadsheet\src\PhpSpreadsheet\Writer\Xlsx\Theme.php:8 Stack trace: #0 {main} thrown in D:\HTTP\htdocs\gincludes\vendor\phpoffice\phpspreadsheet\src\PhpSpreadsheet\Writer\Xlsx\Theme.php on line 8