Fatal error: Uncaught Error: Class "PhpOffice\PhpSpreadsheet\Calculation\Statistical\AggregateBase" not found in D:\web\teleflex\tst\assets\phpspreadsheet\Calculation\Statistical\Averages.php:8 Stack trace: #0 {main} thrown in D:\web\teleflex\tst\assets\phpspreadsheet\Calculation\Statistical\Averages.php on line 8