Fatal error: Uncaught Error: Class 'PhpOffice\PhpSpreadsheet\Writer\Xlsx\WriterPart' not found in E:\xampp\htdocs\webhost_v2\vendor\phpoffice\phpspreadsheet\src\PhpSpreadsheet\Writer\Xlsx\RelsRibbon.php:8 Stack trace: #0 {main} thrown in E:\xampp\htdocs\webhost_v2\vendor\phpoffice\phpspreadsheet\src\PhpSpreadsheet\Writer\Xlsx\RelsRibbon.php on line 8