Fatal error: Uncaught Error: Class "PhpOffice\PhpSpreadsheet\Calculation\Financial\FinancialValidations" not found in D:\xampp\htdocs\phpOffice\PhpSpreadsheet\Calculation\Financial\Securities\SecurityValidations.php:9 Stack trace: #0 {main} thrown in D:\xampp\htdocs\phpOffice\PhpSpreadsheet\Calculation\Financial\Securities\SecurityValidations.php on line 9