传递的对象的所有者与原始所有者Exception不匹配

Question

我使用此方法使用UCMA拨打电话，但它给了我一个例外

参数异常未被用户代码

处理

  

传递的对象的所有者与原始所有者不匹配。   参数名称：结果

public void StartCall(OfflineMessage offlineMessage)
{

    _messageFrom = offlineMessage.MessageFrom;
    _messageTo = offlineMessage.MessageTo;
    _messageBody = offlineMessage.MsessageBody;
    _messageTime = offlineMessage.MessageTime;


    try
    {


       _convSettings = new ConversationSettings { Priority = ConversationPriority.Normal };

        _conversation = new Conversation(_applicationEndpoint, _convSettings);
        _convSettings.Subject = _conversation.LocalParticipant.DisplayName;
        _conversation.Impersonate(_messageFrom, _conversation.LocalParticipant.PhoneUri, _conversation.LocalParticipant.DisplayName);
        _instantMessagingCall = new InstantMessagingCall(_conversation);


        _instantMessagingCall.BeginEstablish(_messageTo,_message, null,
            ar =>
            {
                try
                {
                    _instantMessagingCall.EndEstablish(ar);
                    //hook handlers
                    _instantMessagingCall.Flow.MessageReceived += Flow_MessageReceived;
                    _instantMessagingCall.Flow.StateChanged += Flow_StateChanged;
                    SendInstantMessage(_instantMessagingCall);
                }
                catch (RealTimeException ex)
                {

                }
            },
            null);

    }

    catch (Exception)
    {
    }
}

关于此异常的任何想法