Issue with permissions in a node.js module

I built an npm module named emeraldfw and published it. My package.json file is

{
  "name": "emeraldfw",
  "version": "0.6.0",
  "bin": "./emeraldfw.js",
  "description": "Emerald Framework is a language-agnostig web development framework, designed to make developer's lives easier and fun while coding.",
  "main": "emeraldfw.js",
  "directories": {
    "example": "examples",
    "test": "test"
  },
  "scripts": {
    "test": "mocha"
  },
  "repository": {
    "type": "git",
    "url": "git+https://github.com/EdDeAlmeidaJr/emeraldfw.git"
  },
  "keywords": [
    "web",
    "development",
    "framework",
    "language",
    "agnostic",
    "react"
  ],
  "author": "Ed de Almeida",
  "license": "MIT",
  "bugs": {
    "url": "https://github.com/EdDeAlmeidaJr/emeraldfw/issues"
  },
  "homepage": "https://github.com/EdDeAlmeidaJr/emeraldfw#readme",
  "devDependencies": {
    "jshint": "^2.9.4",
    "mocha": "^3.3.0"
  },
  "dependencies": {
    "jsonfile": "^3.0.0",
    "react": "^15.5.4",
    "vorpal": "^1.12.0"
  }
}

As you may see, I declared a "bin": "./emeraldfw.js" binary, which corresponds to the application itself. The package.json documentations says this is going to create a link to the application executable at node.js bin/ directory. This worked fine, but when I install it globally (npm install emeraldfw -g) and then run it from the command line I receive an error messsage

All other node modules are working fine and my application is passing in all tests and when I run it directly inside the development directory (with node emeraldfw.js) it works really fine.

I'm not a node.js expert and after having fought this error for two days, here I am to ask for help.

Any ideas?

via Ed de Almeida