System.NullReferenceException: Object reference not set to an instance of an object



I have been using keras module. At certain point my old algos started giving me this error:


System.NullReferenceException: Object reference not set to an instance of an object
at Python.Runtime.Dispatcher.Dispatch (System.Collections.ArrayList args) [0x00018] in <0f995c28c5b446ad8835419f76b319a3>:0 
at __System_EventHandler`1[[QuantConnect_Data_Market_TradeBar, QuantConnect_Common, Version=2_4_0_0, Culture=neutral, PublicKeyToken=null]]Dispatcher.Invoke (System.Object , QuantConnect.Data.Market.TradeBar ) [0x00018] in <404737580f4c43f09e3571fd3219f088>:0 
at QuantConnect.Data.Consolidators.PeriodCountConsolidatorBase`2[T, TConsolidated].OnDataConsolidated (TConsolidated e) [0x0001d] in :0 
at QuantConnect.Data.Consolidators.PeriodCountConsolidatorBase`2[T, TConsolidated].Update (T data) [0x00265] in :0 
at QuantConnect.Data.Consolidators.DataConsolidator`1[TInput].Update (QuantConnect.Data.IBaseData data) [0x00046] in :0 
at QuantConnect.Lean.Engine.AlgorithmManager.Run (QuantConnect.Packets.AlgorithmNodePacket job, QuantConnect.Interfaces.IAlgorithm algorithm, QuantConnect.Lean.Engine.DataFeeds.IDataFeed feed, QuantConnect.Lean.Engine.TransactionHandlers.ITransactionHandler transactions, QuantConnect.Lean.Engine.Results.IResultHandler results, QuantConnect.Lean.Engine.RealTime.IRealTimeHandler realtime, QuantConnect.Lean.Engine.Server.ILeanManager leanManager, QuantConnect.Lean.Engine.Alpha.IAlphaHandler alphas, System.Threading.CancellationToken token) [0x00f97] in Lean.Engine.Alpha.IAlphaHandler alphas, System.Threading.CancellationToken token) [0x00f97] in <2006430fa8154de385aea0ee80b63ec4>:0 


Does anybody know, what is going on here? If I don't use keras in the code, it works fine.

Update Backtest

The error System.NullReferenceException occurs when you are trying to use something that is NULL. This means the object was either set to NULL, or nothing was ever set. There are a few reasons why this could occur: it could be TradeBar construction, a history request, or even security symbols. For example, the simple algorithm below creates this error because a security object instead of a symbol object was passed. If an algorithm were attached, determining the specific problem would be easier.

class BasicTemplateAlgorithm(QCAlgorithm):

def Initialize(self):

self.SetStartDate(2013,10, 7)
self.SetCash(100000) = self.AddEquity("SPY", Resolution.Daily)

def OnData(self, data):

if not self.Portfolio.Invested:
self.SetHoldings("SPY", 1)

Update Backtest


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