When adding Bitfnex as my market I seemed to have trouble. I am manually adding from a dictionary created with the crypto listed on the documentation page. 

 

        for i in range(len(self.symbols)):
            crypto = self.AddCrypto(self.symbols[i],Resolution.Minute, Market.Bitfinex).Symbol
            self.symbols[i] = crypto
            self.symbols[i].prices = []
            self.symbols[i].dates = []
 

I am attempting to use the equity strategy for crypto currency: 

https://www.quantconnect.com/tutorials/strategy-library/intraday-dynamic-pairs-trading-using-correlation-and-cointegration-approach