Kraken trade service not working

[Gepro83]

I am using xchange-stream-kraken:5.0.8, and getting the same exception when placing any order (tried limit and market):

Exception in thread "main" org.knowm.xchange.exceptions.ExchangeException: [EGeneral:Invalid arguments]
at org.knowm.xchange.kraken.service.KrakenBaseService.checkResult(KrakenBaseService.java:97)
at org.knowm.xchange.kraken.service.KrakenTradeServiceRaw.placeKrakenOrder(KrakenTradeServiceRaw.java:270)
at org.knowm.xchange.kraken.service.KrakenTradeServiceRaw.placeKrakenLimitOrder(KrakenTradeServiceRaw.java:222)
at org.knowm.xchange.kraken.service.KrakenTradeService.placeLimitOrder(KrakenTradeService.java:52)

maybe the kraken API has changed?