Upgrading to Rails 3.1

I'm working on updating my rails 3.0.5 app to rails 3.1.0.beta1 and I seem to be running into a problem when doing `rake rails:update` when it runs `rake rails:update:javascripts`

Here is my bundle: Gems included by the bundle:   * RedCloth (4.2.7)   * actionmailer (3.1.0.beta1)   * actionpack (3.1.0.beta1)   * activemodel (3.1.0.beta1)   * activerecord (3.1.0.beta1)   * activeresource (3.1.0.beta1)   * activesupport (3.1.0.beta1)   * ancestry (1.2.4)   * annotate (2.4.0)   * ansi (1.2.5)   * arel (2.1.0)   * bcrypt-ruby (2.1.4)   * builder (3.0.0)   * bundler (1.0.13)   * coffee-script (2.2.0)   * coffee-script-source (1.1.0)   * daemons (1.1.3)   * erubis (2.7.0)   * eventmachine (0.12.10)   * execjs (0.3.4)   * hike (1.0.0)   * hoptoad_notifier (2.4.9)   * i18n (0.6.0beta1)   * jquery-rails (1.0.2)   * kaminari (0.12.4)   * mail (2.3.0)   * mime-types (1.16)   * multi_json (1.0.2)   * mustang (0.2.2)   * polyglot (0.3.1)   * rack (1.3.0.beta)   * rack-cache (1.0.1)   * rack-mount (0.7.4)   * rack-ssl (1.3.2)   * rack-test (0.6.0)   * rails (3.1.0.beta1)   * railties (3.1.0.beta1)   * rake (0.8.7)   * sass (3.1.1)   * simple_form (1.3.1)   * sprockets (2.0.0.beta.2)   * sqlite3 (1.3.3)   * thin (1.2.11)   * thor (0.14.6)   * tilt (1.3)   * treetop (1.4.9)   * turn (0.8.2)   * tzinfo (0.3.27)   * uglifier (0.5.3)

Here is the trace:

** Invoke rails:update:javascripts (first_time) ** Execute rails:update:javascripts rake aborted! undefined method `create_javascript_files' for #<Rails::Generators::AppGenerator:0x0000000294c968> /usr/local/rvm/gems/ruby-1.9.2-p180/gems/railties-3.1.0.beta1/lib/rails/tasks/framework.rake:40:in `invoke_from_app_generator' /usr/local/rvm/gems/ruby-1.9.2-p180/gems/railties-3.1.0.beta1/lib/rails/tasks/framework.rake:63:in `block (3 levels) in <top (required)>' /usr/local/rvm/gems/ruby-1.9.2-p180/gems/rake-0.8.7/lib/rake.rb:636:in `call' /usr/local/rvm/gems/ruby-1.9.2-p180/gems/rake-0.8.7/lib/rake.rb:636:in `block in execute' /usr/local/rvm/gems/ruby-1.9.2-p180/gems/rake-0.8.7/lib/rake.rb:631:in `each' /usr/local/rvm/gems/ruby-1.9.2-p180/gems/rake-0.8.7/lib/rake.rb:631:in `execute' /usr/local/rvm/gems/ruby-1.9.2-p180/gems/rake-0.8.7/lib/rake.rb:597:in `block in invoke_with_call_chain' /usr/local/rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/monitor.rb:201:in `mon_synchronize' /usr/local/rvm/gems/ruby-1.9.2-p180/gems/rake-0.8.7/lib/rake.rb:590:in `invoke_with_call_chain' /usr/local/rvm/gems/ruby-1.9.2-p180/gems/rake-0.8.7/lib/rake.rb:607:in `block in invoke_prerequisites' /usr/local/rvm/gems/ruby-1.9.2-p180/gems/rake-0.8.7/lib/rake.rb:604:in `each' /usr/local/rvm/gems/ruby-1.9.2-p180/gems/rake-0.8.7/lib/rake.rb:604:in `invoke_prerequisites' /usr/local/rvm/gems/ruby-1.9.2-p180/gems/rake-0.8.7/lib/rake.rb:596:in `block in invoke_with_call_chain' /usr/local/rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/monitor.rb:201:in `mon_synchronize' /usr/local/rvm/gems/ruby-1.9.2-p180/gems/rake-0.8.7/lib/rake.rb:590:in `invoke_with_call_chain' /usr/local/rvm/gems/ruby-1.9.2-p180/gems/rake-0.8.7/lib/rake.rb:583:in `invoke' /usr/local/rvm/gems/ruby-1.9.2-p180/gems/rake-0.8.7/lib/rake.rb:2051:in `invoke_task' /usr/local/rvm/gems/ruby-1.9.2-p180/gems/rake-0.8.7/lib/rake.rb:2029:in `block (2 levels) in top_level' /usr/local/rvm/gems/ruby-1.9.2-p180/gems/rake-0.8.7/lib/rake.rb:2029:in `each' /usr/local/rvm/gems/ruby-1.9.2-p180/gems/rake-0.8.7/lib/rake.rb:2029:in `block in top_level' /usr/local/rvm/gems/ruby-1.9.2-p180/gems/rake-0.8.7/lib/rake.rb:2068:in `standard_exception_handling' /usr/local/rvm/gems/ruby-1.9.2-p180/gems/rake-0.8.7/lib/rake.rb:2023:in `top_level' /usr/local/rvm/gems/ruby-1.9.2-p180/gems/rake-0.8.7/lib/rake.rb:2001:in `block in run' /usr/local/rvm/gems/ruby-1.9.2-p180/gems/rake-0.8.7/lib/rake.rb:2068:in `standard_exception_handling' /usr/local/rvm/gems/ruby-1.9.2-p180/gems/rake-0.8.7/lib/rake.rb:1998:in `run' /usr/local/rvm/gems/ruby-1.9.2-p180/gems/rake-0.8.7/bin/rake:31:in `<top (required)>' /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 `<main>'