arcgis 10.2 javascript legend says "no legend"

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1 - I create a map, called myMap.

2 - myMap contains 3 layers.

3 - if i comment the ", layerInfos..." line below, the legend appears correctly, displaying symbology for the three layers.

4 - if i remove the comment from the ", layerInfos..." line below, a"no legend" sign appears

5 - Firebug show no errors

var myMap = initMap();var legendDijit = new Legend({ map: myMap , layerInfos: {layer: myMap.getLayer(myMap.layerIds[2])}}, "legendDiv");legendDijit.startup();thanks



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