[Observium] JpGraph

Hi,

I try to install jpgraph. I follow the instruction :

No Jpgraph installed *Jpgraph has been removed from the Observium repositories and must now be installed separately* * Please download from http://jpgraph.net/download/ and unpack to html/includes/jpgraph. * Remove the theme definition from the bottom of html/includes/jpgraph/src/jpg-config.inc.php

when I refresh the page a get a jpgraph error 25121.

Anyone can help me on this ?