Error on doubango_rt.Agents

What steps will reproduce the problem?
1.
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What is the expected output? What do you see instead?

What version of the product are you using? On what operating system?

Please provide any additional information below.

{System.InvalidCastException: Unable to cast object of type 
'doubango_rt.BackEnd.OutOfProcess.Server' to type 
'doubango_rt.BackEnd.OutOfProcess.__IServerPublicNonVirtuals'.
   at System.StubHelpers.StubHelpers.GetCOMIPFromRCW_WinRT(Object objSrc, IntPtr pCPCMD, IntPtr& ppTarget)
   at doubango_rt.BackEnd.OutOfProcess.Server.get_SipService()
   at org.doubango.WindowsPhone.BackgroundProcessController.get_SipService()
   at Viavel.rtServiceManager.get_SipService()
   at Viavel.MainPage.buttonSaveSettings_Click(Object sender, RoutedEventArgs e)
   at System.Windows.Controls.Primitives.ButtonBase.OnClick()
   at System.Windows.Controls.Button.OnClick()
   at System.Windows.Controls.Primitives.ButtonBase.OnMouseLeftButtonUp(MouseButtonEventArgs e)
   at System.Windows.Controls.Control.OnMouseLeftButtonUp(Control ctrl, EventArgs e)
   at MS.Internal.JoltHelper.FireEvent(IntPtr unmanagedObj, IntPtr unmanagedObjArgs, Int32 argsTypeIndex, Int32 actualArgsTypeIndex, String eventName)}

public SipService SipService
        {
            get
            {
                if (this.server != null)
                {
                    HERE => return this.server.SipService;
                }
                return null;
            }
        }

When i try 

new Thread(() =>
            {
                SipService sipService = rtServiceManager.Instance.SipService;
                if (sipService != null && sipService.SipActiveAVCall == null)
                { ....
Original issue reported on code.google.com by betoando...@gmail.com on 10 Jan 2015 at 9:33
Suvarna1488 / boghe

Error on doubango_rt.Agents #209
