NullReferenceException-in-InteractiveBrokers-IBBroker-GetSymbolDecimals

I am getting the following error message whenever it's triggered a new entry:

System.NullReferenceException: Object reference not set to an instance of an object.
at (Object )
at †††
†††ˆ‡˜.†††
†††‡–Ž(Object , †††
†††ˆ‡˜ )
at WealthLab.InteractiveBrokers.IBConnection.†††
††††‡(Contract )
at WealthLab.InteractiveBrokers.IBBroker.GetSymbolDecimals(String symbol, Double price)
at WealthLab.Backtest.Transaction.GetExporter(Object , Object , Double price)
at WealthLab.Backtest.Transaction.get_OrderPriceDecimals()
at WealthLab.Backtest.Transaction.get_PriceFormatCode()
at WealthLab.Backtest.Transaction.get_OrderPriceDisplay()
at WealthLab.Backtest.Transaction.get_Description()
at WealthLab.Backtest.Transaction.ToString()
at System.Windows.Automation.Peers.FrameworkElementAutomationPeer.GetNameCore()
at System.Windows.Automation.Peers.AutomationPeer.GetName()
at System.Windows.Automation.Peers.ItemAutomationPeer.GetNameCore()
at System.Windows.Automation.Peers.AutomationPeer.UpdateSubtree()
at System.Windows.Automation.Peers.AutomationPeer.UpdateSubtree()
at System.Windows.Automation.Peers.AutomationPeer.UpdateSubtree()
at System.Windows.Automation.Peers.AutomationPeer.UpdateSubtree()
at System.Windows.Automation.Peers.AutomationPeer.UpdateSubtree()
at System.Windows.Automation.Peers.AutomationPeer.UpdateSubtree()
at System.Windows.Automation.Peers.AutomationPeer.UpdateSubtree()
at System.Windows.ContextLayoutManager.fireAutomationEvents()
at System.Windows.ContextLayoutManager.UpdateLayout()
at System.Windows.Controls.VirtualizingStackPanel.<>c__DisplayClass94_0.<InitializeViewport>b__0()
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)