Fatal error: Uncaught Error: Class "PhpOffice\PhpSpreadsheet\Writer\BaseWriter" not found in /export/vol2/httpd/htdocs/administration/facilities/webapps/fluidsecure-billing/PHPSpreadsheet/Writer/Xls.php:27
Stack trace:
#0 {main}
  thrown in /export/vol2/httpd/htdocs/administration/facilities/webapps/fluidsecure-billing/PHPSpreadsheet/Writer/Xls.php on line 27