extend script is not working in photoshop but working fine in illustrator

function ImageTracingPaste(){
var len=0;
var CountPath=0;
var dirImages = new Folder(ClipBoard_image_path);
var imagesList = dirImages.getFiles('*.jpeg');
var length=imagesList.length;
Paste_Image = imagesList[length-1].name;
var index;
var doc = app.activeDocument;
var DocLayerCount=doc.layers.length;
for(var i=0;i<DocLayerCount;i++){
if(doc.layers[i].name==Paste_Layer){
index=i;
break;
}
}
if(doc.layers[index].groupItems.length>0 && doc.layers[index].pageItems[0].name !="Clipped_Group"){
ExpendFunction(index,0);
}
var len=doc.layers[index].pageItems.length;
for(var i=0;i<len;i++){
CountPath++;
var pathitm=doc.layers[index].pageItems[i];
if(pathitm.name!="Clipped_Group"){
var placedItem1 = doc.layers[index].placedItems.add();
placedItem1.moveToEnd(doc.layers[index]);
placedItem1.file = new File(ClipBoard_image_path+"/"+Paste_Image);
placedItem1.selected=true;
pathitm.selected=true;
app.executeMenuCommand("makeMask");
doc.layers[index].pageItems[i].name="Clipped_Group";
exportFileToJPEG();
} else{
pathitm.placedItems.removeAll();
var plcd=pathitm.placedItems.add();
plcd.moveToEnd(pathitm);
plcd.file = new File(ClipBoard_image_path+"/"+Paste_Image);
exportFileToJPEG();
}
}
return Paste_Image+","+CountPath;
}