showing problem in using czml example at my local machine

CesiumJS
1

hello
i want to use that czm example for my purpose so for this i start it to run on my local machine after changing all the requirements but it is not running
some part of that is running like when i m using czml for label then it is running here is the code of that

{
“id”:"/Application/STK/Scenario/simple/Facility/AGI",
“label”:{
“fillColor”:{
“rgba”:[
0,255,255,255
]
},
“font”:“10pt Lucida Console”,
“horizontalOrigin”:“LEFT”,
“outlineColor”:{
“rgba”:[
0,0,0,255
]
},
“pixelOffset”:{
“cartesian2”:[
12.0,0.0
]
},
“scale”:1.0,
“show”:true,
“style”:“FILL”,
“text”:“AGI”,
“verticalOrigin”:“CENTER”
},
“position”:{
“cartesian”:[
1216469.9357990976,-4736121.71856379,4081386.8856866374
]
}
}

but i also want to show image on that same place also then it is not running n also not giving any error code for that is here

{
“id”:“Headquarters”,
“availability” : “2013-11-08T09:00:00Z/2013-11-09T17:04:54.9962195740191Z”,
“billboard”:{
“color”:{
“rgba”:[
0,255,255,255
]
},
“horizontalOrigin”:“LEFT”,
“image”:“localhost//Cesium-b19/Apps/Sandcastle/images/DownArrow.png”,
“scale”:1.0,
“show”:true,
“verticalOrigin”:“CENTER”
},
“position”:{
“epoch” : “2013-11-08T09:00:00Z”,
“cartesian”:[
1216469.9357990976,-4736121.71856379,4081386.8856866374

  ]
  }

}

can anyone please tell me what is the problem that is happening with that code???