Cumulus Support

I am trying to create the graphs using jpgraph in our site http://www.achaiki.eu/weather/omplos but I seem to encounter all sorts of problems. I have installed the necessary scripts in my server but I cannot produce any graphs. The errors are as in files




I feel that instructions become far too complicated for me to follow. Is it possible to have simple instructions as to how the installation should proceed in as simple steps as possible, please?

Thank you