Fatal error: Uncaught Error: Class "Plot" not found in /System/Volumes/Data/Web/CHG/php_charts/jpgraph-4.4.1/src/jpgraph_contour.php:387
Stack trace:
#0 {main}
thrown in /System/Volumes/Data/Web/CHG/php_charts/jpgraph-4.4.1/src/jpgraph_contour.php on line 387