code: function(err){
  			var indicator = lib.node(this._prefix+this._id);
  			indicator.src = require.toUrl("images/problem.gif");
  			indicator.className = "";
  			
  			new mTooltip.Tooltip({
  				node: indicator,
  				text: err
  			});
  		}
docs: [interface] renders the progress indicator after an population error