Fatal error: Uncaught Error: Class "PhpOffice\PhpSpreadsheet\DefinedName" not found in D:\xampp\htdocs\vendor\phpoffice\phpspreadsheet\NamedFormula.php:7 Stack trace: #0 {main} thrown in D:\xampp\htdocs\vendor\phpoffice\phpspreadsheet\NamedFormula.php on line 7