Fatal error: Uncaught Error: Class "OpenSpout\Writer\Common\Manager\AbstractWorkbookManager" not found in /srv/www/htdocs/moodle/lib/openspout/src/Writer/XLSX/Manager/WorkbookManager.php:22 Stack trace: #0 {main} thrown in /srv/www/htdocs/moodle/lib/openspout/src/Writer/XLSX/Manager/WorkbookManager.php on line 22