Fatal error: Uncaught Error: Class "PHPCompatibility\AbstractRemovedFeatureSniff" not found in /var/www/html/upload/PhpSpreadsheet-master/vendor/phpcompatibility/php-compatibility/PHPCompatibility/Sniffs/Constants/RemovedConstantsSniff.php:23 Stack trace: #0 {main} thrown in /var/www/html/upload/PhpSpreadsheet-master/vendor/phpcompatibility/php-compatibility/PHPCompatibility/Sniffs/Constants/RemovedConstantsSniff.php on line 23