Fatal error: Uncaught Error: Class 'Graph' not found in C:\xampp\htdocs\BeiDou_website\z\class\Dgraph\jpgraph\jpgraph_canvas.php:20 Stack trace: #0 {main} thrown in C:\xampp\htdocs\BeiDou_website\z\class\Dgraph\jpgraph\jpgraph_canvas.php on line 20