Fatal error: Uncaught Error: Class "PhpOffice\PhpSpreadsheet\Worksheet\Dimension" not found in D:\xampp\htdocs\phpOffice\PhpSpreadsheet\Worksheet\ColumnDimension.php:8 Stack trace: #0 {main} thrown in D:\xampp\htdocs\phpOffice\PhpSpreadsheet\Worksheet\ColumnDimension.php on line 8