Fatal error: Uncaught Error: Class 'Matrix' not found in C:\Apache241\htdocs\phpexcel\Classes\PHPExcel\Shared\JAMA\examples\tile.php:74 Stack trace: #0 {main} thrown in C:\Apache241\htdocs\phpexcel\Classes\PHPExcel\Shared\JAMA\examples\tile.php on line 74