Edge Animate CC :: JSON Content - Can't Display Image After Click

I am trying to to load a JSON file and load images with text information.
 
I have a problem when i click the thumbnail, the large image can't displayed, i am receiving the following error:
 
Failed to load resource: the server responded with a status of 404 (Not Found)
 
my code in compositionReady:
 
$.getJSON("content.json",
function(data){
for(var i=0; i<=data.length; i++){
var s = sym.createChildSymbol("template","content");
s.$("title").html(data[i].title);

[code]...

and at the element that hold's the thumbnail image, I added on the click event :
 
sym.$("finte").css({"background-image":"url("+$(this).data('largeimage ')+")"}); 
 
I believe that somewhere on +$(this).data('largeimage')+") is the mistake. But I can't find it.Moreover, how, the thumbnails, can be displayed as a table of 4x5?