title: `undefined method `[]' for nil:NilClass` in Rails 4.0.1 and HAML
body: <p><strong>EDIT #2:</strong> I just downgraded back to Rails 4.0.0 from 4.0.1 and it solved the problem... if anyone knows what was causing it and how I can safely upgrade to 4.0.1, please let me know. Or maybe this is an issue with 4.0.1 or HAML that should be reported? I don't know where to report it to...</p>
  
  <hr>
  
  <p>My HAML view, which was working fine yesterday, and which I haven't changed, somehow isn't working anymore.</p>
  
  <p>The view:</p>
  
  <pre><code>1 =form_for @document do |f|
  2
  3  =f.text_field :title, placeholder: "Title"
  4
  5  =f.text_field :slug, placeholder: "URL slug"
  6
  7  ... and more
  </code></pre>
  
  <p>And the error it throws from line 1:</p>
  
  <pre><code>undefined method `[]' for nil:NilClass
  </code></pre>
  
  <p><code>@document</code> is instantiated in the controller as <code>Document.new</code>. Like I said, this code worked fine yesterday and I haven't changed the view or the controller. I upgraded from Rails 4.0.0 to 4.0.1 today - could this be the culprit?</p>
  
  <p>My <code>Gemfile.lock</code>:</p>
  
  <pre><code>GIT
    remote: git://github.com/adzap/active_enum.git
    revision: 280548e3954d8f9e032968dd2757b7e5862cdf49
    specs:
      active_enum (0.9.12)
        activesupport (&gt;= 3.0)
  
  GIT
  
    remote: git://github.com/sporkrb/spork-rails.git
    revision: 0dd45e59d3237b4c8f9efc215b46d9c07072a95e
    specs:
      spork-rails (4.0.0)
        rails (&gt;= 3.0.0, &lt; 5)
        spork (&gt;= 1.0rc0)
  
  GEM
    remote: https://rubygems.org/
    specs:
      actionmailer (4.0.1)
        actionpack (= 4.0.1)
        mail (~&gt; 2.5.4)
      actionpack (4.0.1)
        activesupport (= 4.0.1)
        builder (~&gt; 3.1.0)
        erubis (~&gt; 2.7.0)
        rack (~&gt; 1.5.2)
        rack-test (~&gt; 0.6.2)
      active_model_serializers (0.8.1)
        activemodel (&gt;= 3.0)
      activemodel (4.0.1)
        activesupport (= 4.0.1)
        builder (~&gt; 3.1.0)
      activerecord (4.0.1)
        activemodel (= 4.0.1)
        activerecord-deprecated_finders (~&gt; 1.0.2)
        activesupport (= 4.0.1)
        arel (~&gt; 4.0.0)
      activerecord-deprecated_finders (1.0.3)
      activesupport (4.0.1)
        i18n (~&gt; 0.6, &gt;= 0.6.4)
        minitest (~&gt; 4.2)
        multi_json (~&gt; 1.3)
        thread_safe (~&gt; 0.1)
        tzinfo (~&gt; 0.3.37)
      annotate (2.5.0)
        rake
      ansi (1.4.3)
      arel (4.0.1)
      atomic (1.1.14)
      aws-sdk (1.22.1)
        json (~&gt; 1.4)
        nokogiri (&gt;= 1.4.4, &lt; 1.6.0)
        uuidtools (~&gt; 2.1)
      bcrypt-ruby (3.1.2)
      bootstrap-sass (2.3.1.0)
        sass (~&gt; 3.2)
      builder (3.1.4)
      capybara (2.1.0)
        mime-types (&gt;= 1.16)
        nokogiri (&gt;= 1.3.3)
        rack (&gt;= 1.0.0)
        rack-test (&gt;= 0.5.4)
        xpath (~&gt; 2.0)
      capybara-webkit (1.0.0)
        capybara (~&gt; 2.0, &gt;= 2.0.2)
        json
      celluloid (0.15.2)
        timers (~&gt; 1.1.0)
      childprocess (0.3.9)
        ffi (~&gt; 1.0, &gt;= 1.0.11)
      climate_control (0.0.3)
        activesupport (&gt;= 3.0)
      cocaine (0.5.2)
        climate_control (&gt;= 0.0.3, &lt; 1.0)
      coderay (1.0.9)
      coffee-rails (4.0.0)
        coffee-script (&gt;= 2.2.0)
        railties (&gt;= 4.0.0.beta, &lt; 5.0)
      coffee-script (2.2.0)
        coffee-script-source
        execjs
      coffee-script-source (1.5.0)
      columnize (0.3.6)
      database_cleaner (1.1.1)
      debugger (1.6.2)
        columnize (&gt;= 0.3.1)
        debugger-linecache (~&gt; 1.2.0)
        debugger-ruby_core_source (~&gt; 1.2.3)
      debugger-linecache (1.2.0)
      debugger-ruby_core_source (1.2.3)
      devise (3.1.1)
        bcrypt-ruby (~&gt; 3.0)
        orm_adapter (~&gt; 0.1)
        railties (&gt;= 3.2.6, &lt; 5)
        thread_safe (~&gt; 0.1)
        warden (~&gt; 1.2.3)
      diff-lcs (1.2.4)
      dropbox-sdk (1.6.1)
        json
      erubis (2.7.0)
      ethon (0.5.12)
        ffi (&gt;= 1.3.0)
        mime-types (~&gt; 1.18)
      execjs (1.4.0)
        multi_json (~&gt; 1.0)
      factory_girl (4.1.0)
        activesupport (&gt;= 3.0.0)
      factory_girl_rails (4.1.0)
        factory_girl (~&gt; 4.1.0)
        railties (&gt;= 3.0.0)
      faker (1.2.0)
        i18n (~&gt; 0.5)
      fakeweb (1.3.0)
      faraday (0.8.8)
        multipart-post (~&gt; 1.2.0)
      ffi (1.9.0)
      figaro (0.7.0)
        bundler (~&gt; 1.0)
        rails (&gt;= 3, &lt; 5)
      font-awesome-sass-rails (3.0.2.2)
        railties (&gt;= 3.1.1)
        sass-rails (&gt;= 3.1.1)
      formatador (0.2.4)
      guard (2.0.5)
        formatador (&gt;= 0.2.4)
        listen (~&gt; 2.0)
        lumberjack (~&gt; 1.0)
        pry (&gt;= 0.9.12)
        thor (&gt;= 0.18.1)
      guard-rspec (1.2.1)
        guard (&gt;= 1.1)
      guard-spork (1.5.1)
        childprocess (&gt;= 0.2.3)
        guard (&gt;= 1.1)
        spork (&gt;= 0.8.4)
      haml (4.0.4)
        tilt
      hashie (2.0.5)
      hashr (0.0.22)
      hike (1.2.3)
      httpauth (0.2.0)
      i18n (0.6.5)
      jquery-rails (3.0.1)
        railties (&gt;= 3.0, &lt; 5.0)
        thor (&gt;= 0.14, &lt; 2.0)
      json (1.8.0)
      jwt (0.1.8)
        multi_json (&gt;= 1.5)
      libv8 (3.16.14.3)
      listen (2.1.0)
        celluloid (&gt;= 0.15.2)
        rb-fsevent (&gt;= 0.9.3)
        rb-inotify (&gt;= 0.9)
      lumberjack (1.0.4)
      mail (2.5.4)
        mime-types (~&gt; 1.16)
        treetop (~&gt; 1.4.8)
      method_source (0.8.2)
      mime-types (1.25.1)
      minitest (4.7.5)
      multi_json (1.8.2)
      multipart-post (1.2.0)
      nokogiri (1.5.9)
      oauth2 (0.8.1)
        faraday (~&gt; 0.8)
        httpauth (~&gt; 0.1)
        jwt (~&gt; 0.1.4)
        multi_json (~&gt; 1.0)
        rack (~&gt; 1.2)
      omniauth (1.1.4)
        hashie (&gt;= 1.2, &lt; 3)
        rack
      omniauth-github (1.1.0)
        omniauth (~&gt; 1.0)
        omniauth-oauth2 (~&gt; 1.1)
      omniauth-oauth2 (1.1.1)
        oauth2 (~&gt; 0.8.0)
        omniauth (~&gt; 1.0)
      orm_adapter (0.4.0)
      paperclip (3.5.1)
        activemodel (&gt;= 3.0.0)
        activesupport (&gt;= 3.0.0)
        cocaine (~&gt; 0.5.0)
        mime-types
      pg (0.15.1)
      polyglot (0.3.3)
      protected_attributes (1.0.3)
        activemodel (&gt;= 4.0.0, &lt; 5.0)
      pry (0.9.12.2)
        coderay (~&gt; 1.0.5)
        method_source (~&gt; 0.8)
        slop (~&gt; 3.4)
      rack (1.5.2)
      rack-test (0.6.2)
        rack (&gt;= 1.0)
      rails (4.0.1)
        actionmailer (= 4.0.1)
        actionpack (= 4.0.1)
        activerecord (= 4.0.1)
        activesupport (= 4.0.1)
        bundler (&gt;= 1.3.0, &lt; 2.0)
        railties (= 4.0.1)
        sprockets-rails (~&gt; 2.0.0)
      rails_12factor (0.0.2)
        rails_serve_static_assets
        rails_stdout_logging
      rails_serve_static_assets (0.0.1)
      rails_stdout_logging (0.0.3)
      railties (4.0.1)
        actionpack (= 4.0.1)
        activesupport (= 4.0.1)
        rake (&gt;= 0.8.7)
        thor (&gt;= 0.18.1, &lt; 2.0)
      rake (10.1.0)
      rb-fsevent (0.9.3)
      rb-inotify (0.9.2)
        ffi (&gt;= 0.5.0)
      ref (1.0.5)
      rest-client (1.6.7)
        mime-types (&gt;= 1.16)
      rspec-core (2.14.7)
      rspec-expectations (2.14.3)
        diff-lcs (&gt;= 1.1.3, &lt; 2.0)
      rspec-mocks (2.14.3)
      rspec-rails (2.14.0)
        actionpack (&gt;= 3.0)
        activesupport (&gt;= 3.0)
        railties (&gt;= 3.0)
        rspec-core (~&gt; 2.14.0)
        rspec-expectations (~&gt; 2.14.0)
        rspec-mocks (~&gt; 2.14.0)
      sass (3.2.12)
      sass-rails (4.0.0)
        railties (&gt;= 4.0.0.beta, &lt; 5.0)
        sass (&gt;= 3.1.10)
        sprockets-rails (~&gt; 2.0.0)
      slop (3.4.6)
      spork (1.0.0rc4)
      sprockets (2.10.1)
        hike (~&gt; 1.2)
        multi_json (~&gt; 1.0)
        rack (~&gt; 1.0)
        tilt (~&gt; 1.1, != 1.3.0)
      sprockets-rails (2.0.1)
        actionpack (&gt;= 3.0)
        activesupport (&gt;= 3.0)
        sprockets (~&gt; 2.8)
      therubyracer (0.12.0)
        libv8 (~&gt; 3.16.14.0)
        ref
      thor (0.18.1)
      thread_safe (0.1.3)
        atomic
      tilt (1.4.1)
      timers (1.1.0)
      tire (0.6.1)
        activemodel (&gt;= 3.0)
        activesupport
        ansi
        hashr (~&gt; 0.0.19)
        multi_json (~&gt; 1.3)
        rake
        rest-client (~&gt; 1.6)
      treetop (1.4.15)
        polyglot
        polyglot (&gt;= 0.3.1)
      typhoeus (0.6.3)
        ethon (~&gt; 0.5.11)
      tzinfo (0.3.38)
      uglifier (2.2.1)
        execjs (&gt;= 0.3.0)
        multi_json (~&gt; 1.0, &gt;= 1.0.2)
      uuidtools (2.1.4)
      vcr (2.5.0)
      warden (1.2.3)
        rack (&gt;= 1.0)
      xpath (2.0.0)
        nokogiri (~&gt; 1.3)
  
  PLATFORMS
    ruby
  
  DEPENDENCIES
    active_enum!
    active_model_serializers
    annotate (= 2.5.0)
    aws-sdk
    bootstrap-sass (= 2.3.1.0)
    capybara (= 2.1.0)
    capybara-webkit (= 1.0.0)
    childprocess (= 0.3.9)
    coffee-rails (= 4.0.0)
    coffee-script-source (= 1.5.0)
    database_cleaner (~&gt; 1.1.1)
    debugger
    devise (= 3.1.1)
    dropbox-sdk (= 1.6.1)
    execjs (= 1.4.0)
    factory_girl_rails (= 4.1.0)
    faker (~&gt; 1.2.0)
    fakeweb (= 1.3.0)
    figaro (= 0.7.0)
    font-awesome-sass-rails (= 3.0.2.2)
    guard-rspec (= 1.2.1)
    guard-spork (= 1.5.1)
    haml
    jquery-rails (= 3.0.1)
    json (= 1.8.0)
    nokogiri (= 1.5.9)
    omniauth (= 1.1.4)
    omniauth-github (= 1.1.0)
    paperclip
    pg (= 0.15.1)
    protected_attributes
    rails (= 4.0.1)
    rails_12factor
    rspec-mocks
    rspec-rails
    sass-rails
    spork-rails!
    therubyracer (= 0.12.0)
    tire
    typhoeus (= 0.6.3)
    uglifier (&gt;= 1.0.3)
    vcr (= 2.5.0)
  </code></pre>
  
  <p>Also, I've just noticed that when I load up the Rails console I'm now getting the following error when I call <code>.new</code> on <em>any</em> ActiveRecord model: <code>Object doesn't support #inspect</code>. Could these two errors be related? What's going on?</p>
  
  <p><strong>EDIT:</strong> As requested, here's the full error trace:</p>
  
  <pre><code>activerecord (4.0.1) lib/active_record/attribute_methods/read.rb:86:in `block in read_attribute'
  activerecord (4.0.1) lib/active_record/attribute_methods/read.rb:84:in `fetch'
  activerecord (4.0.1) lib/active_record/attribute_methods/read.rb:84:in `read_attribute'
  activerecord (4.0.1) lib/active_record/attribute_methods/read.rb:59:in `__temp__9646'
  activerecord (4.0.1) lib/active_record/attribute_methods/primary_key.rb:12:in `to_key'
  actionpack (4.0.1) lib/action_view/record_identifier.rb:80:in `record_key_for_dom_id'
  actionpack (4.0.1) lib/action_view/record_identifier.rb:62:in `dom_id'
  actionpack (4.0.1) lib/action_view/helpers/form_helper.rb:448:in `apply_form_for_options!'
  actionpack (4.0.1) lib/action_view/helpers/form_helper.rb:426:in `form_for'
  haml (4.0.4) lib/haml/helpers/action_view_mods.rb:146:in `form_for_with_haml'
  haml (4.0.4) lib/haml/helpers/action_view_xss_mods.rb:28:in `form_for_with_haml_xss'
  app/views/documents/_form.html.haml:1:in `_app_views_documents__form_html_haml___2743923910659809414_70104327049600'
  actionpack (4.0.1) lib/action_view/template.rb:143:in `block in render'
  activesupport (4.0.1) lib/active_support/notifications.rb:161:in `instrument'
  actionpack (4.0.1) lib/action_view/template.rb:141:in `render'
  actionpack (4.0.1) lib/action_view/renderer/partial_renderer.rb:306:in `render_partial'
  actionpack (4.0.1) lib/action_view/renderer/partial_renderer.rb:279:in `block in render'
  actionpack (4.0.1) lib/action_view/renderer/abstract_renderer.rb:38:in `block in instrument'
  activesupport (4.0.1) lib/active_support/notifications.rb:159:in `block in instrument'
  activesupport (4.0.1) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
  activesupport (4.0.1) lib/active_support/notifications.rb:159:in `instrument'
  actionpack (4.0.1) lib/action_view/renderer/abstract_renderer.rb:38:in `instrument'
  actionpack (4.0.1) lib/action_view/renderer/partial_renderer.rb:278:in `render'
  actionpack (4.0.1) lib/action_view/renderer/renderer.rb:47:in `render_partial'
  actionpack (4.0.1) lib/action_view/helpers/rendering_helper.rb:27:in `render'
  haml (4.0.4) lib/haml/helpers/action_view_mods.rb:10:in `block in render_with_haml'
  haml (4.0.4) lib/haml/helpers.rb:89:in `non_haml'
  haml (4.0.4) lib/haml/helpers/action_view_mods.rb:10:in `render_with_haml'
  app/views/documents/new.html.haml:5:in `_app_views_documents_new_html_haml___1017140852746329293_70104326917800'
  actionpack (4.0.1) lib/action_view/template.rb:143:in `block in render'
  activesupport (4.0.1) lib/active_support/notifications.rb:161:in `instrument'
  actionpack (4.0.1) lib/action_view/template.rb:141:in `render'
  actionpack (4.0.1) lib/action_view/renderer/template_renderer.rb:49:in `block (2 levels) in render_template'
  actionpack (4.0.1) lib/action_view/renderer/abstract_renderer.rb:38:in `block in instrument'
  activesupport (4.0.1) lib/active_support/notifications.rb:159:in `block in instrument'
  activesupport (4.0.1) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
  activesupport (4.0.1) lib/active_support/notifications.rb:159:in `instrument'
  actionpack (4.0.1) lib/action_view/renderer/abstract_renderer.rb:38:in `instrument'
  actionpack (4.0.1) lib/action_view/renderer/template_renderer.rb:48:in `block in render_template'
  actionpack (4.0.1) lib/action_view/renderer/template_renderer.rb:56:in `render_with_layout'
  actionpack (4.0.1) lib/action_view/renderer/template_renderer.rb:47:in `render_template'
  actionpack (4.0.1) lib/action_view/renderer/template_renderer.rb:17:in `render'
  actionpack (4.0.1) lib/action_view/renderer/renderer.rb:42:in `render_template'
  actionpack (4.0.1) lib/action_view/renderer/renderer.rb:23:in `render'
  actionpack (4.0.1) lib/abstract_controller/rendering.rb:127:in `_render_template'
  actionpack (4.0.1) lib/action_controller/metal/streaming.rb:219:in `_render_template'
  actionpack (4.0.1) lib/abstract_controller/rendering.rb:120:in `render_to_body'
  actionpack (4.0.1) lib/action_controller/metal/rendering.rb:33:in `render_to_body'
  actionpack (4.0.1) lib/action_controller/metal/renderers.rb:26:in `render_to_body'
  actionpack (4.0.1) lib/abstract_controller/rendering.rb:97:in `render'
  actionpack (4.0.1) lib/action_controller/metal/rendering.rb:16:in `render'
  actionpack (4.0.1) lib/action_controller/metal/instrumentation.rb:41:in `block (2 levels) in render'
  activesupport (4.0.1) lib/active_support/core_ext/benchmark.rb:12:in `block in ms'
  /Users/george/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/benchmark.rb:296:in `realtime'
  activesupport (4.0.1) lib/active_support/core_ext/benchmark.rb:12:in `ms'
  actionpack (4.0.1) lib/action_controller/metal/instrumentation.rb:41:in `block in render'
  actionpack (4.0.1) lib/action_controller/metal/instrumentation.rb:84:in `cleanup_view_runtime'
  activerecord (4.0.1) lib/active_record/railties/controller_runtime.rb:25:in `cleanup_view_runtime'
  actionpack (4.0.1) lib/action_controller/metal/instrumentation.rb:40:in `render'
  actionpack (4.0.1) lib/action_controller/metal/implicit_render.rb:10:in `default_render'
  actionpack (4.0.1) lib/action_controller/metal/implicit_render.rb:5:in `send_action'
  actionpack (4.0.1) lib/abstract_controller/base.rb:189:in `process_action'
  actionpack (4.0.1) lib/action_controller/metal/rendering.rb:10:in `process_action'
  actionpack (4.0.1) lib/abstract_controller/callbacks.rb:18:in `block in process_action'
  activesupport (4.0.1) lib/active_support/callbacks.rb:403:in `_run__4420817618306697940__process_action__callbacks'
  activesupport (4.0.1) lib/active_support/callbacks.rb:80:in `run_callbacks'
  actionpack (4.0.1) lib/abstract_controller/callbacks.rb:17:in `process_action'
  actionpack (4.0.1) lib/action_controller/metal/rescue.rb:29:in `process_action'
  actionpack (4.0.1) lib/action_controller/metal/instrumentation.rb:31:in `block in process_action'
  activesupport (4.0.1) lib/active_support/notifications.rb:159:in `block in instrument'
  activesupport (4.0.1) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
  activesupport (4.0.1) lib/active_support/notifications.rb:159:in `instrument'
  actionpack (4.0.1) lib/action_controller/metal/instrumentation.rb:30:in `process_action'
  actionpack (4.0.1) lib/action_controller/metal/params_wrapper.rb:245:in `process_action'
  activerecord (4.0.1) lib/active_record/railties/controller_runtime.rb:18:in `process_action'
  actionpack (4.0.1) lib/abstract_controller/base.rb:136:in `process'
  actionpack (4.0.1) lib/abstract_controller/rendering.rb:44:in `process'
  actionpack (4.0.1) lib/action_controller/metal.rb:195:in `dispatch'
  actionpack (4.0.1) lib/action_controller/metal/rack_delegation.rb:13:in `dispatch'
  actionpack (4.0.1) lib/action_controller/metal.rb:231:in `block in action'
  actionpack (4.0.1) lib/action_dispatch/routing/route_set.rb:80:in `call'
  actionpack (4.0.1) lib/action_dispatch/routing/route_set.rb:80:in `dispatch'
  actionpack (4.0.1) lib/action_dispatch/routing/route_set.rb:48:in `call'
  actionpack (4.0.1) lib/action_dispatch/journey/router.rb:71:in `block in call'
  actionpack (4.0.1) lib/action_dispatch/journey/router.rb:59:in `each'
  actionpack (4.0.1) lib/action_dispatch/journey/router.rb:59:in `call'
  actionpack (4.0.1) lib/action_dispatch/routing/route_set.rb:680:in `call'
  warden (1.2.3) lib/warden/manager.rb:35:in `block in call'
  warden (1.2.3) lib/warden/manager.rb:34:in `catch'
  warden (1.2.3) lib/warden/manager.rb:34:in `call'
  rack (1.5.2) lib/rack/etag.rb:23:in `call'
  rack (1.5.2) lib/rack/conditionalget.rb:25:in `call'
  rack (1.5.2) lib/rack/head.rb:11:in `call'
  actionpack (4.0.1) lib/action_dispatch/middleware/params_parser.rb:27:in `call'
  actionpack (4.0.1) lib/action_dispatch/middleware/flash.rb:241:in `call'
  rack (1.5.2) lib/rack/session/abstract/id.rb:225:in `context'
  rack (1.5.2) lib/rack/session/abstract/id.rb:220:in `call'
  actionpack (4.0.1) lib/action_dispatch/middleware/cookies.rb:486:in `call'
  activerecord (4.0.1) lib/active_record/query_cache.rb:36:in `call'
  activerecord (4.0.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:626:in `call'
  actionpack (4.0.1) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call'
  activesupport (4.0.1) lib/active_support/callbacks.rb:373:in `_run__3348029417397685055__call__callbacks'
  activesupport (4.0.1) lib/active_support/callbacks.rb:80:in `run_callbacks'
  actionpack (4.0.1) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
  actionpack (4.0.1) lib/action_dispatch/middleware/reloader.rb:64:in `call'
  actionpack (4.0.1) lib/action_dispatch/middleware/remote_ip.rb:76:in `call'
  actionpack (4.0.1) lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call'
  actionpack (4.0.1) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call'
  railties (4.0.1) lib/rails/rack/logger.rb:38:in `call_app'
  railties (4.0.1) lib/rails/rack/logger.rb:20:in `block in call'
  activesupport (4.0.1) lib/active_support/tagged_logging.rb:67:in `block in tagged'
  activesupport (4.0.1) lib/active_support/tagged_logging.rb:25:in `tagged'
  activesupport (4.0.1) lib/active_support/tagged_logging.rb:67:in `tagged'
  railties (4.0.1) lib/rails/rack/logger.rb:20:in `call'
  actionpack (4.0.1) lib/action_dispatch/middleware/request_id.rb:21:in `call'
  rack (1.5.2) lib/rack/methodoverride.rb:21:in `call'
  rack (1.5.2) lib/rack/runtime.rb:17:in `call'
  activesupport (4.0.1) lib/active_support/cache/strategy/local_cache.rb:83:in `call'
  rack (1.5.2) lib/rack/lock.rb:17:in `call'
  actionpack (4.0.1) lib/action_dispatch/middleware/static.rb:64:in `call'
  rack (1.5.2) lib/rack/sendfile.rb:112:in `call'
  railties (4.0.1) lib/rails/engine.rb:511:in `call'
  railties (4.0.1) lib/rails/application.rb:97:in `call'
  rack (1.5.2) lib/rack/lock.rb:17:in `call'
  rack (1.5.2) lib/rack/content_length.rb:14:in `call'
  rack (1.5.2) lib/rack/handler/webrick.rb:60:in `service'
  /Users/george/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/webrick/httpserver.rb:138:in `service'
  /Users/george/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/webrick/httpserver.rb:94:in `run'
  /Users/george/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/webrick/server.rb:295:in `block in start_thread'
  </code></pre>