Fatal error: Uncaught Error: Class "OpenSpout\Common\Entity\Cell" not found in /srv/www/htdocs/moodle/lib/openspout/src/Common/Entity/Cell/FormulaCell.php:12 Stack trace: #0 {main} thrown in /srv/www/htdocs/moodle/lib/openspout/src/Common/Entity/Cell/FormulaCell.php on line 12