Fatal error: Uncaught Error: Class "Plot" not found in D:\HTTP\htdocs\gincludes\jpgraph-4.4.1\src\jpgraph_contour_ku.php:395 Stack trace: #0 {main} thrown in D:\HTTP\htdocs\gincludes\jpgraph-4.4.1\src\jpgraph_contour_ku.php on line 395