Fatal error: undefined is not a function

[Pascal Cañadas]

Hello,
For 2 days I desperately try to use this grunt module.
My file Gruntfile.js

'use strict';
module.exports = function(grunt) {

  grunt.initConfig({
    pkg: grunt.file.readJSON('package.json'),
    nwjs: {
      options: {
        version: '0.3.0',
        buildDir: './dist', // Where the build version of my NW.js app is saved
        platforms: ['win', 'linux'], // These are the platforms that we want to build
        flavor: 'normal'
      },
      src: ['rotateur/**/*'] // Your NW.js app
    },
  });


  grunt.loadNpmTasks('grunt-nw-builder');
  grunt.registerTask('default', ['nwjs']);
};

My package.json:

{
  "name": "Rotateur",
  "author": "leknoppix",
  "description": "Application en node Webkit pour retourner des images sans outil graphique",
  "version": "0.3.0",
  "devDependencies": {
    "grunt": "^1.0.1",
    "grunt-cli": "^1.2.0",
    "grunt-nw-builder": "latest"
  }
}

A screenprint

And my package.json present in the folder rotation:

{
  "name": "Rotateur",
  "main": "index.html",
  "description": "Application en node Webkit pour retourner des images sans outil graphique",
  "version": "0.3.0",
  "window": {
    "toolbar": false,
    "height": 800,
    "width:": 1000,
    "frame": true,
    "icon": "icons/logo.png"
  },
  "dependencies": {
    "fs": "0.0.1-security",
    "image-preloader": "^1.1.1",
    "jimp": "^0.2.27",
    "mkdirp": "^0.5.1",
    "path": "^0.12.7",
    "piexifjs": "^1.0.0"
  }
}

When I laught the command grunt nwjs, I get:

grunt nwjs
Running "nwjs:src" (nwjs) task
Fatal error: undefined is not a function

I do not understand what I'm doing wrong.

leknoppix

[Pascal Cañadas]

Activate the verbose, I get:
test.txt

[Pascal Cañadas]

In my ubuntu machine, it's impossible to compile.
But my problem is solve with debian!