Rake and Uninitialized Constants - ruby-on-rails

Question

I have spent hours upon days trying to resolve this.
Rake is throwing the following error:
dcarpenter$ rake
rake aborted!
uninitialized constant ActionView::Helpers::JavaScriptProxy
I can't seem to find anyone who has had this issue on Google, this site or elsewhere.
What steps should I take to resolve this and what do I need to know?
rake --trace yields:
/Users/dcarpenter/Dropbox/workspace/gems/rake-0.9.2/lib/rake/ext/module.rb:36:in `const_missing'
/Users/dcarpenter/Dropbox/workspace/gems/jrails-0.6.0/lib/jrails.rb:231:in `<module:Helpers>'
/Users/dcarpenter/Dropbox/workspace/gems/jrails-0.6.0/lib/jrails.rb:2:in `<module:ActionView>'
/Users/dcarpenter/Dropbox/workspace/gems/jrails-0.6.0/lib/jrails.rb:1:in `<top (required)>'
/Users/dcarpenter/Dropbox/workspace/gems/bundler-1.0.17/lib/bundler/runtime.rb:68:in `require'
/Users/dcarpenter/Dropbox/workspace/gems/bundler-1.0.17/lib/bundler/runtime.rb:68:in `block (2 levels) in require'
/Users/dcarpenter/Dropbox/workspace/gems/bundler-1.0.17/lib/bundler/runtime.rb:66:in `each'
/Users/dcarpenter/Dropbox/workspace/gems/bundler-1.0.17/lib/bundler/runtime.rb:66:in `block in require'
/Users/dcarpenter/Dropbox/workspace/gems/bundler-1.0.17/lib/bundler/runtime.rb:55:in `each'
/Users/dcarpenter/Dropbox/workspace/gems/bundler-1.0.17/lib/bundler/runtime.rb:55:in `require'
/Users/dcarpenter/Dropbox/workspace/gems/bundler-1.0.17/lib/bundler.rb:120:in `require'
/Users/dcarpenter/Dropbox/workspace/BlueFusion/config/application.rb:9:in `<top (required)>'
/Users/dcarpenter/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
/Users/dcarpenter/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
/Users/dcarpenter/Dropbox/workspace/BlueFusion/Rakefile:4:in `<top (required)>'
/Users/dcarpenter/Dropbox/workspace/gems/rake-0.9.2/lib/rake/rake_module.rb:25:in `load'
/Users/dcarpenter/Dropbox/workspace/gems/rake-0.9.2/lib/rake/rake_module.rb:25:in `load_rakefile'
/Users/dcarpenter/Dropbox/workspace/gems/rake-0.9.2/lib/rake/application.rb:495:in `raw_load_rakefile'
/Users/dcarpenter/Dropbox/workspace/gems/rake-0.9.2/lib/rake/application.rb:78:in `block in load_rakefile'
/Users/dcarpenter/Dropbox/workspace/gems/rake-0.9.2/lib/rake/application.rb:129:in `standard_exception_handling'
/Users/dcarpenter/Dropbox/workspace/gems/rake-0.9.2/lib/rake/application.rb:77:in `load_rakefile'
/Users/dcarpenter/Dropbox/workspace/gems/rake-0.9.2/lib/rake/application.rb:61:in `block in run'
/Users/dcarpenter/Dropbox/workspace/gems/rake-0.9.2/lib/rake/application.rb:129:in `standard_exception_handling'
/Users/dcarpenter/Dropbox/workspace/gems/rake-0.9.2/lib/rake/application.rb:59:in `run'
/Users/dcarpenter/Dropbox/workspace/gems/rake-0.9.2/bin/rake:32:in `<top (required)>'
/Users/dcarpenter/.rvm/rubies/ruby-1.9.2-p290/bin/rake:19:in `load'
/Users/dcarpenter/.rvm/rubies/ruby-1.9.2-p290/bin/rake:19:in `<main>'
gem list yields:
abstract (1.0.0)
actionmailer (3.1.0.rc5, 3.0.9)
actionpack (3.1.0.rc5, 3.0.9)
activemodel (3.1.0.rc5, 3.0.9)
activerecord (3.1.0.rc5, 3.0.9)
activeresource (3.1.0.rc5, 3.0.9)
activesupport (3.1.0.rc5, 3.0.9)
addressable (2.2.6)
arel (2.1.4, 2.0.10)
barby (0.4.3)
bcrypt-ruby (2.1.4)
builder (3.0.0, 2.1.2)
bundler (1.0.17)
chunky_png (1.2.1)
compass (0.11.5)
erubis (2.7.0, 2.6.6)
faraday (0.7.4)
faraday_middleware (0.7.0)
fssm (0.2.7)
hashie (1.0.0)
hike (1.2.0)
i18n (0.6.0, 0.5.0)
jrails (0.6.0)
json (1.5.3)
jwt (0.1.3)
koala (1.1.0)
linkedin (0.3.1)
mail (2.3.0, 2.2.19)
mime-types (1.16)
multi_json (1.0.3)
multi_xml (0.2.2)
multipart-post (1.1.3)
mysql2 (0.2.11)
oauth (0.4.5)
polyglot (0.3.2)
pr_geohash (1.0.0)
rack (1.3.2, 1.2.3)
rack-cache (1.0.2)
rack-mount (0.8.2, 0.6.14)
rack-ssl (1.3.2)
rack-test (0.6.1, 0.5.7)
rails (3.1.0.rc5)
railties (3.1.0.rc5)
rake (0.9.2, 0.8.7)
rdoc (3.9.2)
sass (3.1.7)
simple_oauth (0.1.5)
sprockets (2.0.0.beta.13)
thor (0.14.6)
tilt (1.3.2)
treetop (1.4.10)
twilio-ruby (3.3.0)
twitter (1.6.1)
tzinfo (0.3.29)

Answer 1

Just for the sake of saying, jrails is not complatible with Rails 3 and the project is basically dead since 2009. If you are on Rails 3 you should use the jquery-ujs gem that kind of fills in the hole jrails used to get into.
This does not mean it's just going to work, but it's the first step of you really want to move on to Rails 3.