Fatal error: Uncaught Error: Class "PhpOffice\PhpSpreadsheet\Shared\Date" not found in /itss/home/arcelormittal/public_html/vendor/phpoffice/phpspreadsheet/tests/data/Calculation/Statistical/SLOPE.php:29 Stack trace: #0 {main} thrown in /itss/home/arcelormittal/public_html/vendor/phpoffice/phpspreadsheet/tests/data/Calculation/Statistical/SLOPE.php on line 29