Fatal error: Uncaught Error: Class 'Box\Spout\Writer\Common\Helper\AbstractStyleHelper' not found in /var/www/html/lib/spout-2.7.2/src/Spout/Writer/ODS/Helper/StyleHelper.php:14 Stack trace: #0 {main} thrown in /var/www/html/lib/spout-2.7.2/src/Spout/Writer/ODS/Helper/StyleHelper.php on line 14