Hmmm. As far as I can tell, I'm using the latest version of rake:

$ gem update
Updating installed gems
Nothing to update
$ which rake
/Users/spatten/.rvm/gems/ruby-1.8.7-p334/bin/rake
$ rake --version
rake, version 0.9.2
$ ruby --version
ruby 1.8.7 (2011-02-18 patchlevel 334) [i686-darwin10.6.0]
$ rails --version
Rails 3.1.0.rc4
$ rake doc:guides
Generating 3_0_release_notes.html
rake aborted!
uninitialized constant
ActionView::Helpers::AssetTagHelper::AssetPaths::Mutex

Tasks: TOP => doc:guides
(See full trace by running task with --trace)



On Jun 13, 10:59 pm, Wael Nasreddine <[email protected]>
wrote:
> Try updating rake
>
> $ sudo gem update
>
> --
> Wael Nasreddine
> Sent from my iPhone
>
> On Jun 14, 2011, at 7:56, spatten <[email protected]> wrote:
>
>
>
>
>
>
>
> > I did some further testing:
>
> > 1) I tried a more recent version of Ruby 1.8.7 using rvm, and still
> > had the same error
>
> > $ ruby --version
> > ruby 1.8.7 (2011-02-18 patchlevel 334) [i686-darwin10.6.0]
>
> > 2) I tried ruby 1.9.2, and was able to install the guides
> > successfully.
>
> > Thanks,
>
> > Scott Patten
>
> > On Jun 13, 10:05 pm, spatten <[email protected]> wrote:
> >> When I run rake doc:guides with a fresh Rails 3.1.0 rc4 app, I get the
> >> following error:
>
> >> # sudo rake doc:guides
> >> Generating 3_0_release_notes.html
> >> rake aborted!
> >> uninitialized constant
> >> ActionView::Helpers::AssetTagHelper::AssetPaths::Mutex
>
> >> Tasks: TOP => doc:guides
> >> (See full trace by running task with --trace)
>
> >> Steps to reproduce:
>
> >> $ rails --version
> >> Rails 3.1.0.rc4
> >> $ ruby --version
> >> ruby 1.8.7 (2009-06-12 patchlevel 174) [universal-darwin10.0]
> >> $ rails new railsdoctester
> >> $ cd railsdoctester
> >> $ echo "gem 'RedCloth'" >>
> >> Gemfile
> >> $ bundle install
> >> $ sudo rake doc:guides
>
> >> Here is the output with trace on:
>
> >> $ sudo rake doc:guides --trace
> >> ** Invoke doc:guides (first_time)
> >> ** Execute doc:guides
> >> Generating action_controller_overview.html
> >> rake aborted!
> >> uninitialized constant
> >> ActionView::Helpers::AssetTagHelper::AssetPaths::Mutex
> >> /Library/Ruby/Gems/1.8/gems/rake-0.9.2/lib/rake/ext/module.rb:36:in
> >> `const_missing'
> >> /Library/Ruby/Gems/1.8/gems/actionpack-3.1.0.rc4/lib/action_view/
> >> helpers/asset_tag_helpers/asset_paths.rb:66
> >> /Library/Ruby/Gems/1.8/gems/actionpack-3.1.0.rc4/lib/action_view/
> >> helpers/asset_tag_helper.rb:3:in `require'
> >> /Library/Ruby/Gems/1.8/gems/actionpack-3.1.0.rc4/lib/action_view/
> >> helpers/asset_tag_helper.rb:3
> >> /Library/Ruby/Gems/1.8/gems/actionpack-3.1.0.rc4/lib/action_view/
> >> helpers.rb:38
> >> /Library/Ruby/Gems/1.8/gems/actionpack-3.1.0.rc4/lib/action_view/
> >> base.rb:134
> >> /Library/Ruby/Gems/1.8/gems/railties-3.1.0.rc4/guides/rails_guides/
> >> generator.rb:135:in `generate_guide'
> >> /Library/Ruby/Gems/1.8/gems/railties-3.1.0.rc4/guides/rails_guides/
> >> generator.rb:134:in `open'
> >> /Library/Ruby/Gems/1.8/gems/railties-3.1.0.rc4/guides/rails_guides/
> >> generator.rb:134:in `generate_guide'
> >> /Library/Ruby/Gems/1.8/gems/railties-3.1.0.rc4/guides/rails_guides/
> >> generator.rb:102:in `generate_guides'
> >> /Library/Ruby/Gems/1.8/gems/railties-3.1.0.rc4/guides/rails_guides/
> >> generator.rb:100:in `each'
> >> /Library/Ruby/Gems/1.8/gems/railties-3.1.0.rc4/guides/rails_guides/
> >> generator.rb:100:in `generate_guides'
> >> /Library/Ruby/Gems/1.8/gems/railties-3.1.0.rc4/guides/rails_guides/
> >> generator.rb:78:in `generate'
> >> /Library/Ruby/Gems/1.8/gems/railties-3.1.0.rc4/guides/rails_guides.rb:
> >> 50
> >> /Library/Ruby/Gems/1.8/gems/railties-3.1.0.rc4/lib/rails/tasks/
> >> documentation.rake:122:in `require'
> >> /Library/Ruby/Gems/1.8/gems/railties-3.1.0.rc4/lib/rails/tasks/
> >> documentation.rake:122
> >> /Library/Ruby/Gems/1.8/gems/rake-0.9.2/lib/rake/task.rb:205:in `call'
> >> /Library/Ruby/Gems/1.8/gems/rake-0.9.2/lib/rake/task.rb:205:in
> >> `execute'
> >> /Library/Ruby/Gems/1.8/gems/rake-0.9.2/lib/rake/task.rb:200:in `each'
> >> /Library/Ruby/Gems/1.8/gems/rake-0.9.2/lib/rake/task.rb:200:in
> >> `execute'
> >> /Library/Ruby/Gems/1.8/gems/rake-0.9.2/lib/rake/task.rb:158:in
> >> `invoke_with_call_chain'
> >> /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/
> >> 1.8/monitor.rb:242:in `synchronize'
> >> /Library/Ruby/Gems/1.8/gems/rake-0.9.2/lib/rake/task.rb:151:in
> >> `invoke_with_call_chain'
> >> /Library/Ruby/Gems/1.8/gems/rake-0.9.2/lib/rake/task.rb:144:in
> >> `invoke'
> >> /Library/Ruby/Gems/1.8/gems/rake-0.9.2/lib/rake/application.rb:112:in
> >> `invoke_task'
> >> /Library/Ruby/Gems/1.8/gems/rake-0.9.2/lib/rake/application.rb:90:in
> >> `top_level'
> >> /Library/Ruby/Gems/1.8/gems/rake-0.9.2/lib/rake/application.rb:90:in
> >> `each'
> >> /Library/Ruby/Gems/1.8/gems/rake-0.9.2/lib/rake/application.rb:90:in
> >> `top_level'
> >> /Library/Ruby/Gems/1.8/gems/rake-0.9.2/lib/rake/application.rb:129:in
> >> `standard_exception_handling'
> >> /Library/Ruby/Gems/1.8/gems/rake-0.9.2/lib/rake/application.rb:84:in
> >> `top_level'
> >> /Library/Ruby/Gems/1.8/gems/rake-0.9.2/lib/rake/application.rb:62:in
> >> `run'
> >> /Library/Ruby/Gems/1.8/gems/rake-0.9.2/lib/rake/application.rb:129:in
> >> `standard_exception_handling'
> >> /Library/Ruby/Gems/1.8/gems/rake-0.9.2/lib/rake/application.rb:59:in
> >> `run'
> >> /Library/Ruby/Gems/1.8/gems/rake-0.9.2/bin/rake:32
> >> /usr/bin/rake:19:in `load'
> >> /usr/bin/rake:19
> >> Tasks: TOP => doc:guides
>
> > --
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