Fatal error: Uncaught Error: Class 'PhpOffice\PhpSpreadsheet\Writer\BaseWriter' not found in /opt/lampp/htdocs/us/vendor/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Writer/Html.php:27 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/us/vendor/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Writer/Html.php on line 27