i am not able to get the individual parameters from the dictionary... it is throwing none type error.i have not defined custom_message function. brokerTicks = self.ticker.subscribe(symbol=Symbols,data_type='symbolData') ticks = [] for symbol_data in brokerTicks: isd = Instruments.getInstrumentDataBySymbol(symbol_data['symbol']) tradingSymbol = isd['symbol'] tick = TickData(tradingSymbol) tick.lastTradedPrice = symbol_data['ltp'] tick.lastTradedQuantity = symbol_data['last_traded_quantity'] tick.avgTradedPrice = symbol_data['avg_trade_price'] tick.volume = symbol_data['vol_traded_today'] tick.totalBuyQuantity = symbol_data['tot_buy_qty'] tick.totalSellQuantity = symbol_data['tot_sell_qty'] tick.open = symbol_data['open_price'] tick.high = symbol_data['high_price'] tick.low = symbol_data['low_price'] tick.close = symbol_data['close