Fatal error: Uncaught Error: Class "PhpOffice\PhpSpreadsheet\Writer\Html" not found in /home/eregistrandocom/public_html/vendor/phpoffice/phpspreadsheet/tests/PhpSpreadsheetTests/CustomWriter.php:10 Stack trace: #0 {main} thrown in /home/eregistrandocom/public_html/vendor/phpoffice/phpspreadsheet/tests/PhpSpreadsheetTests/CustomWriter.php on line 10