title: rake aborted! undefined method `name' for "actionmailer":String
body: <p>I have a problems with launching rails project. My environtment:</p>
  
  <pre>
  <code>
  rails -v
  2.3.2
  ruby -v 
  1.8.7 (2012-10-12 patchlevel 371) [i686-darwin11.4.2]
  gem -v 
  1.8.6
  </code>
  </pre>
  
  <p>When I try to start rails:</p>
  
  <pre><code>
  $ script/server
  /Users/bmalets/.rvm/gems/ruby-1.8.7-p371@global/gems/activesupport-2.3.2/lib/active_support/dependencies.rb:55: uninitialized constant ActiveSupport::Dependencies::Mutex (NameError)
      from /Users/bmalets/.rvm/rubies/ruby-1.8.7-p371/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:36:in `gem_original_require'
      from /Users/bmalets/.rvm/rubies/ruby-1.8.7-p371/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:36:in `require'
      from /Users/bmalets/.rvm/gems/ruby-1.8.7-p371@global/gems/activesupport-2.3.2/lib/active_support.rb:56
      from /Users/bmalets/.rvm/rubies/ruby-1.8.7-p371/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:36:in `gem_original_require'
      from /Users/bmalets/.rvm/rubies/ruby-1.8.7-p371/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:36:in `require'
      from /Users/bmalets/.rvm/gems/ruby-1.8.7-p371@global/gems/rails-2.3.2/lib/commands/server.rb:1
      from /Users/bmalets/.rvm/rubies/ruby-1.8.7-p371/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:36:in `gem_original_require'
      from /Users/bmalets/.rvm/rubies/ruby-1.8.7-p371/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:36:in `require'
      from script/server:3
  </code></pre>
  
  <p>Help me to solve this problem, please.</p>
  
  <p>When I try to install gems, I have:</p>
  
  <pre><code>
  $ rake gems:install
  (in /Users/bmalets/Documents/ror_projects/myapp)
  rake aborted!
  undefined method `name' for "actionmailer":String
  </code></pre>