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錯誤使用Rails 3.1和Heroku，下面是當我嘗試heroku rake db:migrate時得到的錯誤，對此的任何幫助都非常感謝。使用Rails和Heroku的錯誤
Arugil1 git:(master) heroku rake db:migrate
rake aborted!
undefined local variable or method `config' for main:Object
Tasks: TOP => db:migrate => environmen
(See full trace by running task with --trace)
➜ Arugil1 git:(master) heroku rake db:migrate --trace
** Invoke db:migrate (first_time)
** Invoke environment (first_time)
** Execute environment
rake aborted!
undefined local variable or method `config' for main:Object
/app/config/environment.rb:3:in `<top (required)>'
/app/.bundle/gems/ruby/1.9.1/gems/activesupport- 3.1.0.rc6/lib/active_support/dependencies.rb:237:in `require'
/app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.1.0.rc6/lib/active_support/dependencies.rb:237:in `block in require'
/app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.1.0.rc6/lib/active_support/dependencies.rb:223:in `block in load_dependency'
/app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.1.0.rc6/lib/active_support/dependencies.rb:636:in `new_constants_in'
/app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.1.0.rc6/lib/active_support/dependencies.rb:223:in `load_dependency'
/app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.1.0.rc6/lib/active_support/dependencies.rb:237:in `require'
/app/.bundle/gems/ruby/1.9.1/gems/railties-3.1.0.rc6/lib/rails/application.rb:78:in `require_environment!'
/app/.bundle/gems/ruby/1.9.1/gems/railties-3.1.0.rc6/lib/rails/application.rb:189:in `block (2 levels) in initialize_tasks'
/app/.bundle/gems/ruby/1.9.1/gems/rake-0.9.2/lib/rake/task.rb:205:in `call'
/app/.bundle/gems/ruby/1.9.1/gems/rake-0.9.2/lib/rake/task.rb:205:in `block in execute'
/app/.bundle/gems/ruby/1.9.1/gems/rake-0.9.2/lib/rake/task.rb:200:in `each'
/app/.bundle/gems/ruby/1.9.1/gems/rake-0.9.2/lib/rake/task.rb:200:in `execute'
/app/.bundle/gems/ruby/1.9.1/gems/rake-0.9.2/lib/rake/task.rb:158:in `block in invoke_with_call_chain'
/usr/ruby1.9.2/lib/ruby/1.9.1/monitor.rb:201:in `mon_synchronize'
/app/.bundle/gems/ruby/1.9.1/gems/rake-0.9.2/lib/rake/task.rb:151:in `invoke_with_call_chain'
/app/.bundle/gems/ruby/1.9.1/gems/rake-0.9.2/lib/rake/task.rb:176:in `block in invoke_prerequisites'
/app/.bundle/gems/ruby/1.9.1/gems/rake-0.9.2/lib/rake/task.rb:174:in `each'
/app/.bundle/gems/ruby/1.9.1/gems/rake-0.9.2/lib/rake/task.rb:174:in `invoke_prerequisites'
/app/.bundle/gems/ruby/1.9.1/gems/rake-0.9.2/lib/rake/task.rb:157:in `block in invoke_with_call_chain'
/usr/ruby1.9.2/lib/ruby/1.9.1/monitor.rb:201:in `mon_synchronize'
/app/.bundle/gems/ruby/1.9.1/gems/rake-0.9.2/lib/rake/task.rb:151:in `invoke_with_call_chain'
/app/.bundle/gems/ruby/1.9.1/gems/rake-0.9.2/lib/rake/task.rb:144:in `invoke'
/app/.bundle/gems/ruby/1.9.1/gems/rake-0.9.2/lib/rake/application.rb:112:in `invoke_task'
/app/.bundle/gems/ruby/1.9.1/gems/rake-0.9.2/lib/rake/application.rb:90:in `block (2 levels) in top_level'
/app/.bundle/gems/ruby/1.9.1/gems/rake-0.9.2/lib/rake/application.rb:90:in `each'
/app/.bundle/gems/ruby/1.9.1/gems/rake-0.9.2/lib/rake/application.rb:90:in `block in top_level'
/app/.bundle/gems/ruby/1.9.1/gems/rake-0.9.2/lib/rake/application.rb:129:in `standard_exception_handling'
/app/.bundle/gems/ruby/1.9.1/gems/rake-0.9.2/lib/rake/application.rb:84:in `top_level'
/app/.bundle/gems/ruby/1.9.1/gems/rake-0.9.2/lib/rake/application.rb:62:in `block in run'
/app/.bundle/gems/ruby/1.9.1/gems/rake-0.9.2/lib/rake/application.rb:129:in `standard_exception_handling'
/app/.bundle/gems/ruby/1.9.1/gems/rake-0.9.2/lib/rake/application.rb:59:in `run'
/app/.bundle/gems/ruby/1.9.1/gems/rake-0.9.2/bin/rake:32:in `<top (required)>'
/app/.bundle/gems/ruby/1.9.1/bin/rake:19:in `load'
/app/.bundle/gems/ruby/1.9.1/bin/rake:19:in `<main>'
Tasks: TOP => db:migrate => environment
而且下面是的Gemfile內容：
➜ Arugil1 git:(master) ✗ more Gemfile | grep racer
gem 'therubyracer'
gem 'therubyracer-heroku', '0.8.1.pre3'
gem 'therubyracer-heroku', '0.8.1.pre3'
gem 'therubyracer'
gem 'therubyracer-heroku', '0.8.1.pre3'
gem 'therubyracer'
而且environmnet.rb輸出：
➜ Arugil1 git:(master) ✗ more config/environment.rb
# Load the rails application
require File.expand_path('../application', __FILE__)
# Initialize the rails application
DMr::Application.initialize!`