I am working with a clone of the MultipleSymbolConsolidatonAlgorithm.py algorithm.
I am attempting to add a RollingWindow for the SMA indicator, and then add the RollingWindow data
to the self.Data dictionary.  To allow access of previous period SMA data.
I added the following lines to the code:

    Line 90 -> self.Data[bar.Symbol.Value].smaWin.Add(IndicatorDataPoint)
    Line 132-> self.smaWin = RollingWindow[IndicatorDataPoint](windowSize)

I received the following error.

    Runtime Error: Python.Runtime.PythonException: ArgumentException : Object of type
    'System.RuntimeType' cannot be converted to type 'QuantConnect.Indicators.IndicatorDataPoint'.

Please provide some guidance. I am not sure if I am doing this correctly.

I had to comment out the added lines in order to attach the backtest.

Thank you.

Your help is much appreciated.