Fatal error: Uncaught Error: Class 'ImgData' not found in C:\xampp\htdocs\BeiDou_website\z\class\Dgraph\jpgraph\imgdata_squares.inc.php:11 Stack trace: #0 {main} thrown in C:\xampp\htdocs\BeiDou_website\z\class\Dgraph\jpgraph\imgdata_squares.inc.php on line 11