Fatal error: Uncaught Error: Class "Box\Spout\Writer\AbstractWriter" not found in /home/voters/public_html/vendor/box/spout/src/Spout/Writer/AbstractMultiSheetsWriter.php:13 Stack trace: #0 {main} thrown in /home/voters/public_html/vendor/box/spout/src/Spout/Writer/AbstractMultiSheetsWriter.php on line 13