[Poloniex] Stream order book

[deniua]

Hi.Please help with code)Maybe a bug.
lib: stream-poloniex2
Always this error:
Orderbook update received before initial snapshot
code:
disp = exchange.getStreamingMarketDataService()
.getOrderBook(cp)
.doOnError(error -> System.err.println("The error message is: " + error.getMessage()))
.subscribe(ob -> {});