IdentifyWidget - identifyTask.execute

I run a previous version identifyWidget (not V3.2). After
identifyTask.execute(identifyParams, new AsyncResponder(myResultFunction, myFaultFunction, clickGraphic));
Nothing happens. It means it never goes to
function myResultFunction(results:Array, clickGraphic:com.esri.ags.Graphic = null)
As I know, the operational layer's (also the basemap) spatial reference, which is 102729. I got the error message like that:

[RPC Fault faultString="HTTP request error" faultCode="Server.Error.Request" faultDetail="Error: [IOErrorEvent type="ioError" bubbles=false cancelable=false eventPhase=2 text="Error #2032: Stream Error. URL: file:///C:/identify?tolerance=3&geometry=%7B%22x%22%3A1449154%2E1666666665%2C%22y%22%3A385706%2E3333333333%7D&sr=102729&geometryType=esriGeometryPoint&returnGeometry=true&f=json&mapExtent=1226220%2E8333333335%2C287573%2C1767554%2E1666666665%2C605973&imageDisplay=1015%2C597%2C96&layers=top"]. URL: /identify?tolerance=3&geometry=%7B%22x%22%3A1449154%2E1666666665%2C%22y%22%3A385706%2E3333333333%7D&sr=102729&geometryType=esriGeometryPoint&returnGeometry=true&f=json&mapExtent=1226220%2E8333333335%2C287573%2C1767554%2E1666666665%2C605973&imageDisplay=1015%2C597%2C96&layers=top"]
What the error means? Any hint? Thanks.