gruntjs – grunt致命错误：无法在Yeoman找到本地咕噜声

我安装yeoman并启动了官方文档中提供的示例。
我经历了建议的操作

yo webapp 
    bower install underscore  
    grunt

运行grunt后，我有消息

grunt-cli: The grunt command linE interface. (v0.1.9)

    Fatal error: Unable to find local grunt.

    If you're seeing this message,either a Gruntfile wasn't found or grunt
    hasn't been installed locally to your project. For more information about
    installing and configuring grunt,please see the GetTing Started guide:

    http://gruntjs.com/getTing-started

注意，grunt已经安装

npm install -g grunt-cli

和

npm install -g grunt

yo已经在项目根目录中生成了Gruntfile.js，我正在运行命令。
package.json也已经生成：

"name": "testyo","version": "0.0.0","dependencies": {},"devDependencies": {
      "grunt": "~0.4.1","grunt-contrib-copy": "~0.4.1","grunt-contrib-concat": "~0.1.3","grunt-contrib-coffee": "~0.6.5","grunt-contrib-uglify": "~0.2.0","grunt-contrib-compass": "~0.2.0","grunt-contrib-jshint": "~0.4.1","grunt-contrib-cssmin": "~0.6.0","grunt-contrib-connect": "~0.2.0","grunt-contrib-clean": "~0.4.0","grunt-contrib-htmlmin": "~0.1.3","grunt-contrib-imagemin": "~0.1.3","grunt-contrib-watch": "~0.4.0","grunt-rev": "~0.1.0","grunt-autoprefixer": "~0.1.20130516","grunt-usemin": "~0.1.10","grunt-mocha": "~0.3.0","grunt-open": "~0.2.0","grunt-svgmin": "~0.1.0","grunt-concurrent": "~0.1.0","matchdep": "~0.1.1","connect-livereload": "~0.2.0"
    },"@R_262_10846@nes": {
      "node": ">=0.8.0"
    }

另外。从根目录

grunt --version
    grunt-cli v0.1.9

这确认了grunt可以在每个目录中运行。
任何想法？

sudo npm install grunt --save-dev

npm install