I have created a datawindow graph that is a line graph. I am trying to set the line colour and the type of symbol;

ll_return = this.SetSeriesStyle ('gr_1','AC MW',LineColor!,8257536)
ll_return = this.SetSeriesStyle ('gr_1','AC MW',NoSymbol!)

Both calls to SetSeriesStyle return -1. Why does it return -1? I have tried everything i know to fix the problem. I even went as far as recreating the datawindow and datawindow object. It still returns -1.

How do i find out why it is getting -1?