In a chart with two timefames eg 1min and 5min I want to add an indicator eg EMA(5) calculated upon timeframe 1 and anonther EMA(5) calculated upon 2nd timeframe.
I tried already with ceveral things with AddChartIndicator(EMA(5)) and AddChartIndicator(EMA(BarsArray[0],5)); but it does not work. Can somebody help me
Thanks

Read NT8 section NinjaTrader 8
It shows how to correctly add and reference multi-time frames and instruments.

Concerning AddChartIndicator: It only generates a graphical representation without functionality.
NinjaTrader 8 shows how to correctly add calculations.

In the meantime, NinjaTrader 8 Beta - NinjaTrader Support Forum also contains plenty of examples.

MarcMaes 

In a chart with two timefames eg 1min and 5min I want to add an indicator eg EMA(5) calculated upon timeframe 1 and anonther EMA(5) calculated upon 2nd timeframe. I tried already with ceveral things with AddChartIndicator(EMA(5)) and AddChartIndicator(EMA(BarsArray[0],5)); but it does not work. Can somebody help me Thanks

I realize you have posted some NinjaScript methods but if all you want to do is add two series and apply an EMA to each series, this is easily done without programming.