Intel xdk camera not working it's take default name of images as "test.jpg"

function capturePhoto() {
            intel.xdk.camera.takePicture(50,true,"jpg");
        }
document.addEventListener("intel.xdk.camera.picture.add",function(event){
           
           if (event.success == true)
           {
               var name = event.filename;
               var url = intel.xdk.camera.getPictureURL(name);
        }
 });
document.getElementById("image-holder").innerHTML +=  <img src='"+url+"' id='picture' width='200' height='150' >
   



<input type="button" id="takePicture" value="Take Picture" name="takePicture" >
<div id="image-holder"></div>