Gemfile

# Edit this Gemfile to bundle your application's dependencies.

rails_source_path = "/Users/marioch/Development/libraries/rails"

directory "#{rails_source_path}", :glob => "{*/,}*.gemspec"
git "git://github.com/rails/arel.git"
git "git://github.com/rails/rack.git"

gem "rails", "3.0.pre", :path => "#{rails_source_path}"
%w(activesupport activemodel actionpack actionmailer activerecord activeresource).each do |lib|
	gem lib, '3.0.pre', :path => "#{rails_source_path}#{lib}"
end

## Bundle edge rails:
#gem "rails", :git => "git://github.com/rails/rails.git"

## Bundle the gems you use:
# gem "bj"
# gem "hpricot", "0.6"
gem "sqlite3-ruby", :require_as => "sqlite3"
# gem "aws-s3", :require_as => "aws/s3"
gem "acts_as_taggable_on_steroids"

## Bundle gems used only in certain environments:
gem "rspec", "1.3.0", :git => "git://github.com/dchelimsky/rspec.git", :except => :production
gem "rspec-rails", "1.3.0", :git => "git://github.com/dchelimsky/rspec-rails.git", :except => :production
# only :test do
#   gem "webrat"
# end

rake spec error

MacbookPro:showcase marioch$ rake spec
(in /Users/marioch/Development/proyectos/showcase)
/Library/Ruby/Site/1.8/rubygems.rb:280:in `activate': can't activate actionpack (= 2.3.5, runtime) for [], already activated actionpack-3.0.pre for [] (Gem::LoadError)