I can't get Previous Bar's Low Price

Dear,

I am new in cAlgo language. I am try to develop a cBot. But i am facing one problem. I want to get bar Low/High value and i am using a Zig_ indicator and i want to get value by Bar, but i can't, i write code but not working. 

Print(MarketSeries.Low[1] + "   " + _zigZag.Result[1]);

Above code i want previous bar low value and ZigZag value. but i do get wrong data. 

Above image you will see previous low data not match with my chart previous bar low value, also Zig_ value also 0. Please someone help me

Thanks