I am trying to simply view a list of the symbols that are present in my universe each day, 15 minutes after market open. I have attached the code I have used below. For some reason whatever I do I am usually faced with the following error: "Runtime Error: TypeError : object is not callable TypeError : object is not callable". Any ideas on how to solve this?

class BasicTemplateFrameworkAlgorithm(QCAlgorithm): def Initialize(self): self.UniverseSettings.Resolution = Resolution.Daily self.AddEquity("SPY") self.SetStartDate(2013,10,7) #Set Start Date self.SetEndDate(2013,10,11) #Set End Date self.SetCash(100000) #Set Strategy Cash self.AddUniverse(self.Universe.DollarVolume.Top(50)) self.Schedule.On(self.DateRules.EveryDay("SPY"), self.TimeRules.AfterMarketOpen("SPY", 15), self.ViewUniverse) def ViewUniverse(self): for universe in self.UniverseManager.Values: if universe is UserDefinedUniverse: continue symbols = universe.Members.Keys symbol_list = [] for symbol in symbols: symbol_list.append(symbol) self.Log(symbol_list)