Fatal error: Uncaught Error: Class 'Box\Spout\Writer\WriterMultiSheetsAbstract' not found in /home/aefn/public_html/moodle/lib/spout/src/Spout/Writer/XLSX/Writer.php:12 Stack trace: #0 {main} thrown in /home/aefn/public_html/moodle/lib/spout/src/Spout/Writer/XLSX/Writer.php on line 12