Documentation page has list of available crypto pairs from Bitfinex. However, when I try to run following code in research:

qb = QuantBook()
rrtbtc = qb.AddCrypto("RRTBTC")

I get error:

 Symbol can't be found in the Symbol Properties Database: RRTBTC

Symbols like BTCUSD or LTCUSD work ok. Are there symbols that just not available in research but available in backtesting or I am doing something wrong?