Fatal error: Uncaught Error: Class 'PhpOffice\PhpSpreadsheet\Calculation\Statistical\VarianceBase' not found in /var/www/app/appregwebservice/vendor/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Calculation/Statistical/Variances.php:8 Stack trace: #0 {main} thrown in /var/www/app/appregwebservice/vendor/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Calculation/Statistical/Variances.php on line 8