Fatal error: Uncaught Error: Class "PhpOffice\PhpSpreadsheet\DefinedName" not found in D:\Apache24\www\sanqi\back-end\vendor\phpoffice\phpspreadsheet\src\PhpSpreadsheet\NamedRange.php:8 Stack trace: #0 {main} thrown in D:\Apache24\www\sanqi\back-end\vendor\phpoffice\phpspreadsheet\src\PhpSpreadsheet\NamedRange.php on line 8