In a valid data source must either be deployed IEnumerable I

Question

HI guys, i get the following error when i want to add a resonse as a datasource.

            var service = new TechnicServiceClient();
            var sessionId = Guid.Parse(HttpContext.Current.Session["BWSESSION"].ToString());
            var request = new GetScaEndpointsRequest
            {
                UserId = Request.QueryString["userId"],
                sessionId = sessionId,
                requestId = _requestId,
                requestUsername = null,
                jSessionId = App.User.jSessionId
            };

            var scaDeviceList = service.GetScaEndpoints(request);


            // bind to repeater.DataSource
            //AdditionalDevices.DataSource = App.GetAccessDeviceSca(_user); // get collection of objects
            AdditionalDevices.DataSource = scaDeviceList;
            AdditionalDevices.DataBind();


// the error I get:
Message = "There is an invalid data source used for additional devices. In a valid data source must either be deployed IEnumerable IListSource either."

wtf am i doing wrong ?? thnx guys