Fatal error: Uncaught Error: Class "PhpOffice\PhpSpreadsheet\Calculation\CalculationBase" not found in /var/www/BAFTA/vendor/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Calculation/FunctionArray.php:5 Stack trace: #0 {main} thrown in /var/www/BAFTA/vendor/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Calculation/FunctionArray.php on line 5