title: no such file to load -- "tasks/rails" + rails2 to rails3
body: <p>I have upgraded rails 2.3.11 to rails 3.0.8  using rails_upgrade plugin.  Now I am getting this error and I do not understand why.  Any help you can provide is appreciated!</p>
  
  <pre><code>rake aborted!
  no such file to load -- tasks/rails
  /home/mpn/mpn_admin/branches/to_rails3/Rakefile:13:in `require'
  /home/mpn/mpn_admin/branches/to_rails3/Rakefile:13:in `&lt;top (required)&gt;'
  /usr/local/rvm/gems/ruby-1.9.2-p180/gems/rake-0.9.2/lib/rake/rake_module.rb:25:in `load'
  /usr/local/rvm/gems/ruby-1.9.2-p180/gems/rake-0.9.2/lib/rake/rake_module.rb:25:in `load_rakefile'
  /usr/local/rvm/gems/ruby-1.9.2-p180/gems/rake-0.9.2/lib/rake/application.rb:495:in `raw_load_rakefile'
  /usr/local/rvm/gems/ruby-1.9.2-p180/gems/rake-0.9.2/lib/rake/application.rb:78:in `block in load_rakefile'
  /usr/local/rvm/gems/ruby-1.9.2-p180/gems/rake-0.9.2/lib/rake/application.rb:129:in `standard_exception_handling'
  /usr/local/rvm/gems/ruby-1.9.2-p180/gems/rake-0.9.2/lib/rake/application.rb:77:in `load_rakefile'
  /usr/local/rvm/gems/ruby-1.9.2-p180/gems/rake-0.9.2/lib/rake/application.rb:61:in `block in run'
  /usr/local/rvm/gems/ruby-1.9.2-p180/gems/rake-0.9.2/lib/rake/application.rb:129:in `standard_exception_handling'
  /usr/local/rvm/gems/ruby-1.9.2-p180/gems/rake-0.9.2/lib/rake/application.rb:59:in `run'
  /usr/local/rvm/gems/ruby-1.9.2-p180/gems/rake-0.9.2/bin/rake:32:in `&lt;top (required)&gt;'
  /usr/local/rvm/gems/ruby-1.9.2-p180/bin/rake:19:in `load'
  /usr/local/rvm/gems/ruby-1.9.2-p180/bin/rake:19:in `&lt;main&gt;'
  </code></pre>