A PHP Error was encountered

Severity: Notice

Message: Use of undefined constant IMG_PNG - assumed 'IMG_PNG'

Filename: jpgraph/jpgraph_errhandler.inc.php

Line Number: 188

JpGraph Error Your PHP installation does not seem to have the required GD 2.x library enabled. Please see the PHP documentation, "Image" section. Make sure that "php_gd2.dll" statement is uncomment in the [modules] section in the php.ini file.