Fatal error: Uncaught Error: Class "LinearScale" not found in E:\xampp\htdocs\www\code\jpgraph\src\jpgraph_log.php:19 Stack trace: #0 E:\xampp\htdocs\www\code\jpgraph\src\jpgraph_polar.php(13): require_once() #1 {main} thrown in E:\xampp\htdocs\www\code\jpgraph\src\jpgraph_log.php on line 19