Fatal error: Uncaught Error: Class "PHPCompatibility\AbstractFunctionCallParameterSniff" not found in /var/www/html/upload/PhpSpreadsheet-master/vendor/phpcompatibility/php-compatibility/PHPCompatibility/Sniffs/ParameterValues/RemovedMbstringModifiersSniff.php:33 Stack trace: #0 {main} thrown in /var/www/html/upload/PhpSpreadsheet-master/vendor/phpcompatibility/php-compatibility/PHPCompatibility/Sniffs/ParameterValues/RemovedMbstringModifiersSniff.php on line 33