升级到Yosemite后，使用grunt-contrib-compass获得一个奇怪的错误

Question

升级到yosemitie后，我现在用grunt-contrib-compass得到这个奇怪的错误。我正在使用捆绑器与rbenv。任何人的想法？ gem_path位置甚至不存在于我的系统上，所以我不确定插件是如何生成路径位置的。

Warning: Command failed: /Users/amchang/.rbenv/versions/2.1.4/lib/ruby/site_ruby/2.1.0/rubygems/dependency.rb:315:in `to_specs': Could not find 'compass' (>= 0) among 8 total gem(s) (Gem::LoadError)
    Checked in 'GEM_PATH=/Users/amchang/.rbenv/versions/2.1.4/gemsets/system-gemset', execute `gem env` for more information
        from /Users/amchang/.rbenv/versions/2.1.4/lib/ruby/site_ruby/2.1.0/rubygems/dependency.rb:324:in `to_spec'
        from /Users/amchang/.rbenv/versions/2.1.4/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_gem.rb:58:in `gem'
        from /Users/amchang/.rbenv/versions/2.1.4/bin/compass:22:in `<main>'
     Use --force to continue.

的Gemfile

source 'https://rubygems.org'

gem 'sass', '3.4.6'
gem 'sass-globbing'
gem 'compass', '~> 1.0.1'

的package.json

{
  "devDependencies": {
    "grunt": "~0.4.1",
    "grunt-contrib-jshint": "~0.7.2",
    "grunt-contrib-nodeunit": "~0.1.2",
    "grunt-contrib-compass": "~1.0.1",
    "grunt-contrib-watch": "~0.4.0",
    "bower": "~0.10.0",
    "grunt-bower-requirejs": "~0.4.2",
    "grunt-shell": "~0.3.1",
    "grunt-contrib-requirejs": "~0.4.0",
    "assemble": "~0.4.18",
    "jsdoc": "git://github.com/jsdoc3/jsdoc.git",
    "grunt-contrib-uglify": "~0.4.0",
    "load-grunt-tasks": "~0.2.0",
    "glob": "~3.2.6",
    "lodash": "~2.2.1",
    "grunt-notify": "~0.2.17",
    "time-grunt": "~0.2.9",
    "grunt-concurrent": "~0.4.3",
    "karma": "~0.12.0",
    "karma-chrome-launcher": "~0.1.2",
    "karma-jasmine": "~0.2.1",
    "requirejs": "~2.1.11",
    "karma-requirejs": "~0.2.1",
    "grunt-karma": "~0.8.0"
  }
}