I added "single-instance":false to my package.json file but still I am unable to start multiple instances of my node-webkit app. 

My package.json file:

```
{
  "name": "Name",
  "version": "1",
  "main": "index.html",
  "single-instance": false,
  "window": {
    "frame": true,
    "toolbar": false,
    "resizable": true,
    "min_width": 1000,
    "min_height": 800,
    "icon": "public/images/favicon.png"
  },
  "nodejs": true,
  "node-main": "server.js"
}

```