In a valid data source must either be deployed IEnumerable I

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