Fatal error: Uncaught Error: Class "Graph" not found in /var/www/html/upload/PhpSpreadsheet-master/vendor/mitoteam/jpgraph/src/lib/jpgraph_canvas.php:20 Stack trace: #0 {main} thrown in /var/www/html/upload/PhpSpreadsheet-master/vendor/mitoteam/jpgraph/src/lib/jpgraph_canvas.php on line 20