Requirejs optimization with grunt

Question

I am trying to create a requirejs optimization config with grunt and almond. Here's the config:

requirejs:
      build:
        options:
          almond: true
          dir: 'build'
          appDir: ''
          baseUrl: '../client'
          wrap: true
          include: '../client/main'
          keepBuildDir: true
          paths:
            underscore: 'client/vendor/underscore'
            jquery    : 'client/vendor/jquery'
            backbone  : 'client/vendor/backbone'

Folder Structure:

Error:

C:\Users\User\Documents\Source\Project>grunt requirejs
Running "requirejs:build" (requirejs) task
>> Error: ENOENT, no such file or directory
>> 'C:\Users\User\Documents\Source\Project\build\models\MenuItem.js'
>> In module tree:
>>     ../client/main
Warning: RequireJS failed. Use --force to continue.

Main.js code (written in coffeescript)

requirejs.config(
  baseUrl: "client"
  shim:
    'backbone':
      deps: ['jquery']
      exports: 'Backbone'
    'jquery':
      exports: '$'
    'underscore':
      exports: '_'
  paths:
    jquery: 'vendor/jquery-1.11.0'
    underscore: 'vendor/underscore'
    backbone: 'vendor/backbone'
)

define 'start', ()->
  window.types =
    Models: {}
    Collections: {}
    Views: {}
  null

require ['models/MenuItem', 'views/MenuItem'], (MenuItemModel, MenuItemView)->
  view = new MenuItemView(
    new MenuItemModel(),
    "#app",
    'first'
  )
  view.render();
  null

I want to compile my entire project spread across multiple js files into a single file in a way that requirejs would not be needed. I am trying to do this using almond js but the build task does not look for referenced files relative to the path of referring file. Please help me with the correct configuration.