Fatal error: Uncaught Error: Class 'Graph' not found in /opt/lampp/htdocs/portal/jpgraph-1.27.1/jpgraph/src/Examples/jpgraph/jpgraph_canvas.php:21 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/portal/jpgraph-1.27.1/jpgraph/src/Examples/jpgraph/jpgraph_canvas.php on line 21