Custom main manu

[Pyth]

I tried to make it with this tutorial

but it doesn't work.
I need some help!

I changed only one line:

{
    "images":
    {
        "title":
        {
            "image" : "modpack:textures/title.png", //this line
            "posX" : -137,
            "posY" : 30,
            "width" : 512,
            "height" : 512,
            "alignment" : "top_center"
        }

I created the folder resourses - modpack - textures and put title.png in this folder.
The pic is 1920x1080, 925 KB.
What's wrong?