I have a strategy which trades on the Minute resolution, with two consolidators - 15m and 4Hr. I used a number of indicators, one of which is the MACD, which is instantiated twice - once each for 15m and 4hr.

To obtain the previous MACD value for the 4Hr timeframe, I use a RollingWindow. However, when I tried to access a specific window data, I encounter a runtime error - 


Runtime Error: TypeError : Cannot get managed object
at OnData in main.py:line 105
TypeError : Cannot get managed object (Open Stacktrace)

Have I missed anything ? Here is my source code:

def Initialize(self): '''Initialise the data and resolution required, as well as the cash and start-end dates for your algorithm. All algorithms must initialized.''' self.symbols = ["EURUSD","EURAUD","GBPUSD","AUDUSD"] self.SetStartDate(2016, 1, 1) #Set Start Date self.SetEndDate(2018, 6, 1) #Set End Date self.SetCash(25000) #Set Strategy Cash self.forex = self.AddForex(self.symbols[0], Resolution.Minute, Market.FXCM) self.SetBrokerageModel(BrokerageName.FxcmBrokerage) self.SetWarmup(100) # Trade 15m and 240m timeframes consolidator_15 = QuoteBarConsolidator(15) self.SubscriptionManager.AddConsolidator(self.symbols[0], consolidator_15) consolidator_240 = QuoteBarConsolidator(240) self.SubscriptionManager.AddConsolidator(self.symbols[0], consolidator_240) # Initiatialize indicators self._macd = MovingAverageConvergenceDivergence(self.symbols[0], 12, 26, 9, MovingAverageType.Exponential) self._macdTrend = MovingAverageConvergenceDivergence(self.symbols[0], 12, 26, 9, MovingAverageType.Exponential) self.RegisterIndicator(self.symbols[0], self._macd, consolidator_15) self.RegisterIndicator(self.symbols[0], self._macdTrend, consolidator_240) self._macdTrend.Updated += self.MacdUpdated self._macdWindow = RollingWindow[IndicatorDataPoint](3) self.__previous = datetime.min def OnData(self, data): if self.IsWarmingUp: return # only once per day if self.__previous.date() == self.Time.date(): return # wait for our macd to fully initialize if not ( self._macd.IsReady and self._macdTrend.IsReady) : return self._macdTrend.Previous = self._macdWindow[1] # Problem code here on self._macdTrend.Previous trendMACDUp = self._macdTrend > 0 and (self._macd.Current.Value > self._macdTrend.Previous) self.__previous = self.Time def MacdUpdated(self, sender, updated): self._macdWindow.Add(updated)

Any help is very much appreciated. Thanks.