List No Data

Hello Experts,

I'm trying to fill in my list with data from the gateway service:

var oListStandard1 = new sap.m.List({

  inset : false

  });

  var oItemTemplate1 = new sap.m.StandardListItem({

  type : sap.m.ListType.Navigation,

  title : "{Name}",

  description : "{ID}",

  });

  var oModel = new sap.ui.model.json.JSONModel(

  "http://ws8flex71.sap.flexso.com:8000/sap/opu/odata/sap/YXM_GWS_BART_SRV/mat_group?$format=json");

  oListStandard1.setModel(oModel);

  oListStandard1.bindAggregation("items", "/Name",

  oItemTemplate1);

But when i run the app the list says 'No Data' ...

Kind Regards,

Bart