DIAdem Script : Error occur variable is undefined 'GraphObjNew'

I am new to Diadem and to Script so I am having some trouble creating some very basic code. I am trying to plot curves from data in a DAT file to a graph on a report layout but am getting an error code. I can't figure it out and would be glad if someone could help me out.

Below I have an image of error message and my code. So I use Diadem Evaluation 2018 Version

Thanks!