Fatal error: Uncaught Error: Class "PhpOffice\PhpSpreadsheet\Calculation\CalculationLocale" not found in C:\Dropbox\Websites\vendor\phpoffice\phpspreadsheet\src\PhpSpreadsheet\Calculation\Calculation.php:27 Stack trace: #0 {main} thrown in C:\Dropbox\Websites\vendor\phpoffice\phpspreadsheet\src\PhpSpreadsheet\Calculation\Calculation.php on line 27