API 4.2.3.12. At least one object must implement IComparable.

2014-06-18 10:09:45,439 [27] ERROR - 10:09:45.163 | PlazaTrader     | System.ArgumentException: At least one object must implement IComparable.
   at System.Collections.Comparer.Compare(Object a, Object b)
   at System.Collections.Generic.SortedDictionary`2.KeyValuePairComparer.Compare(KeyValuePair`2 x, KeyValuePair`2 y)
   at System.Collections.Generic.SortedSet`1.FindNode(T item)
   at System.Collections.Generic.SortedDictionary`2.TryGetValue(TKey key, TValue& value)
   at StockSharp.Algo.Connector.GetMarketDepth(Security security)
   at StockSharp.Algo.Connector.#=qxHA4agEevUO$Bva0lsJFlLNS80hWs8xCl$WctJq5vrg=(Security #=qY7DT06BW$QtfrCweUa3F1g==, QuoteChangeMessage #=qMIlxmrzjHIyiFISHK4kIXw==)
   at StockSharp.Algo.Connector.#=qlCC6Ralg1tQ1FPijiwcw$lkZI9IMNZIk4$L2kyQ72WQ=[TMessage](TMessage #=quQOb3iEQI3tM0H0hhy$JOw==, Func`2 #=qlRHkNKwoA9EgNUTv61psfQ==, Action`2 #=qAgKedp70_6pYpwCzcU6KBg==, Boolean #=qZtU$TydpGw67TMsIKrQJSIZ0kstH8UoH$Fta0xWDm6o=)
   at StockSharp.Algo.Connector.OnProcessMessage(Message message, MessageAdapterTypes adapterType, MessageDirections direction)
   at StockSharp.Algo.Connector.#=q5I5EUPQFacpvEFHywORlOeuzSXZSVo1asvywPKPnM$XjvrYtqKYQVf47TMf3DleE(Message #=qiiuriB3zJJklhXJzlrTknQ==)
   at Ecng.Common.DelegateHelper.SafeInvoke[T](Action`1 handler, T arg)
   at StockSharp.Messages.MessageAdapter`1.OnOutMessageProcessor(Message message, IMessageAdapter adapter)
   at System.Action`2.Invoke(T1 arg1, T2 arg2)
   at Ecng.Common.DelegateHelper.SafeInvoke[T1,T2](Action`2 handler, T1 arg1, T2 arg2)
   at StockSharp.Messages.MessageProcessorPool.<StartProcessor>b__0(Message m, IMessageAdapter a)
   at Ecng.Common.DelegateHelper.SafeInvoke[T1,T2](Action`2 handler, T1 arg1, T2 arg2)
   at StockSharp.Messages.MessageProcessor.<StockSharp.Messages.IMessageProcessor.Start>b__0()