title: Error using Rails and Heroku
body: <p>error using Rails 3.1 and Heroku, below is the error I get when I try <code>heroku rake db:migrate</code>, any help on this is highly appreciated.</p>
  
  <pre><code>Arugil1 git:(master) heroku rake db:migrate
  rake aborted!
  undefined local variable or method `config' for main:Object
  
  Tasks: TOP =&gt; db:migrate =&gt; 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 `&lt;top (required)&gt;'
      /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 `&lt;top (required)&gt;'
  /app/.bundle/gems/ruby/1.9.1/bin/rake:19:in `load'
  /app/.bundle/gems/ruby/1.9.1/bin/rake:19:in `&lt;main&gt;'
  Tasks: TOP =&gt; db:migrate =&gt; environment
  </code></pre>
  
  <p>Also below is the Gemfile content:</p>
  
  <pre><code>➜  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'
  </code></pre>
  
  <p>And the environmnet.rb output:</p>
  
  <pre><code>➜  Arugil1 git:(master) ✗ more config/environment.rb 
  # Load the rails application
  require File.expand_path('../application', __FILE__)
  # Initialize the rails application
  DMr::Application.initialize!`
  </code></pre>