I am having this same problem, but I am using Ruby 1.8.7 and an
updated version of RubyGems. Does anyone have an answer for this
issue? I know that Rails 3 does not work at all with 1.9.1, so I tried
1.9.2 and it did not seem to work either. So I decided to go with the
older version.

On Jun 10, 5:02 pm, "Mark A. Richman" <markarich...@gmail.com> wrote:
> I'm having the identical problem with beta4.
>
> On May 8, 10:39 pm, Frank <fburle...@gmail.com> wrote:
>
>
>
> > I've always distrusted the ruby and rails installs on my Mac (oOS X
> > 10.6.3) -- sudo gem cleanup can't seem to get rid of old gem versions
> > (lots of Gem::InstallError: cannot uninstall).
>
> > Because of that, I don't trust the rails beta3 install I just
> > completed.  Here's the story:
>
> > * config is Apple's ruby 1.8.7 and gem 1.3.6.
> > * xcode is installed from Apple's developer site.
> > * gem env result is:
>
> > RubyGems Environment:
> >   - RUBYGEMS VERSION: 1.3.6
> >   - RUBY VERSION: 1.8.7 (2009-06-08 patchlevel 173) [universal-
> > darwin10.0]
> >   - INSTALLATION DIRECTORY: /Library/Ruby/Gems/1.8
> >   - RUBY EXECUTABLE: /System/Library/Frameworks/Ruby.framework/
> > Versions/1.8/usr/bin/ruby
> >   - EXECUTABLE DIRECTORY: /usr/bin
> >   - RUBYGEMS PLATFORMS:
> >     - ruby
> >     - universal-darwin-10
> >   - GEM PATHS:
> >      - /Library/Ruby/Gems/1.8
> >      - /Users/burleigh/.gem/ruby/1.8
> >      - /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/
> > ruby/gems/1.8
> >   - GEM CONFIGURATION:
> >      - :update_sources => true
> >      - :verbose => true
> >      - :benchmark => false
> >      - :backtrace => false
> >      - :bulk_threshold => 1000
> >   - REMOTE SOURCES:
> >      -http://rubygems.org/
>
> > I have done these commands:
>
> > sudo gem update --system
> > sudo gem cleanup
>
> > sudo gem install tzinfo builder i18n memcache-client rack \
> >   rake rack-test rack-mount erubis mail text-format \
> >   thor bundler
> > sodu gem install rails --pre
>
> > whose execution ends with:
>
> > Installing ri documentation for rails-3.0.0.beta3...
> > File not found: lib
>
> > The gems/rails-3.0.0.beta3 directory has a bin directory with a 20
> > character file named "rails."  The other gem directories seem fuller.
>
> > That, combined with the failure of gem cleanup, makes me think "this
> > can't be right."
>
> > I'd appreciate any advice how I might clean up my Mac rails
> > environment.
>
> > Thank you.
>
> > PS: I have so far avoided MacPorts.
>
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