Hi ! The code builds, but I'm getting a Runtime error during the backtest, it says : 

Runtime Error: Value cannot be null.  Parameter name: key (Open Stacktrace)

 

namespace QuantConnect.Algorithm.CSharp { public class MultipleCrypto : QCAlgorithm { // Define variable // USER VARIABLES private int startingCash = 2000; private int maxPosition = 1000; private int minPosition = 500; Resolution res = Resolution.Hour; int fastPeriod = 12; int slowPeriod =26; int sigPeriod = 9; public decimal usd; Dictionary <string,SymbolData> Data = new Dictionary <string,SymbolData>(); List <string> CryptoSymbols = new List<string> { "BTCUSD", "ETHUSD", "LTCUSD" }; int numberOfSymbols => CryptoSymbols.Count; // INITIALIZE public override void Initialize() { SetStartDate(2017, 1, 1); SetEndDate(2018, 1, 1); SetCash(startingCash); foreach (var symbol in CryptoSymbols) // adds each crypto to the Dictionary Data { var crypto = AddCrypto(symbol, res); Data.Add(symbol, new SymbolData(crypto.Symbol, crypto.BaseCurrencySymbol)); } foreach (var key in Data) // assign the Macd to the symbol { var symbolData = key.Value; symbolData.Macd = MACD(symbolData.Symbol, fastPeriod, slowPeriod, sigPeriod, MovingAverageType.Exponential, res); } SetBrokerageModel(BrokerageName.GDAX, AccountType.Cash); } public override void OnData(Slice data) { foreach(var symbolData in Data.Values) { if(!symbolData.Macd.IsReady) {return;} if (symbolData.Macd.IsReady) { usd = Portfolio.CashBook["USD"].Amount; if(!Portfolio[symbolData.Symbol].Invested && usd > minPosition) { if (symbolData.Macd.Fast > symbolData.Macd.Slow) { decimal quantity = Math.Round(Math.Min( usd/numberOfSymbols, maxPosition) / data[symbolData.Symbol].Price, 2); MarketOrder(symbolData.Symbol, quantity); } } if(Portfolio[symbolData.Symbol].Invested) { var holding = Portfolio.CashBook[symbolData.BaseSymbol].Amount; if (symbolData.Macd.Fast < symbolData.Macd.Slow) { MarketOrder(symbolData.Symbol, -holding); } } } } } public class SymbolData { public Symbol Symbol; public string BaseSymbol; public MovingAverageConvergenceDivergence Macd; public SymbolData(Symbol symbol, string BaseSymbol) { Symbol = symbol; BaseSymbol = BaseSymbol; } } } }