Fatal error: Uncaught Error: Class "Generic_Sniffs_NamingConventions_CamelCapsFunctionNameSniff" not found in /var/www/html/upload/PhpSpreadsheet-master/vendor/phpcompatibility/php-compatibility/PHPCompatibility/Sniffs/FunctionNameRestrictions/ReservedFunctionNamesSniff.php:39 Stack trace: #0 {main} thrown in /var/www/html/upload/PhpSpreadsheet-master/vendor/phpcompatibility/php-compatibility/PHPCompatibility/Sniffs/FunctionNameRestrictions/ReservedFunctionNamesSniff.php on line 39