Fatal error: Uncaught Error: Class "PhpOffice\PhpSpreadsheet\Calculation\Financial\FinancialValidations" not found in D:\xampp\htdocs\phpOffice\PhpSpreadsheet\Calculation\Financial\CashFlow\CashFlowValidations.php:10 Stack trace: #0 {main} thrown in D:\xampp\htdocs\phpOffice\PhpSpreadsheet\Calculation\Financial\CashFlow\CashFlowValidations.php on line 10