title: Deploying to Rails project to Heroku: Could not find activemodel
body: <p>I am relatively new to rails and have been working my way through the Michael Hartl Tutorial.  Throughout I have been deploying my projects to Heroku, however now I am at the end of chapter 5, I am getting an "application error". Specifically I am getting the following errors when I look into my Heroku logs:</p>
  
  <pre><code> 2012-01-04T03:05:04+00:00 app[web.1]: Could not find activemodel-3.2.0.rc1 in any of the sources
  2012-01-04T03:05:06+00:00 heroku[web.1]: State changed from starting to crashed
  2012-01-04T03:05:06+00:00 heroku[web.1]: Process exited
  2012-01-04T03:05:11+00:00 heroku[router]: Error H10 (App crashed) -&gt; GET floating-stone 5077.heroku.com/ dyno= queue= wait= service= status=503 bytes=
  </code></pre>
  
  <p>Earlier in the log I see the following errors as well:</p>
  
  <pre><code>WARNING:  Invalid .gemspec format in '/app/.bundle/gems/ruby/1.9.1/specifications/rails-3.2.0.rc1.gemspec'
  WARNING:  Invalid .gemspec format in '/app/.bundle/gems/ruby/1.9.1/specifications/actionmailer-3.2.0.rc1.gemspec'
  WARNING:  Invalid .gemspec format in '/app/.bundle/gems/ruby/1.9.1/specifications/actionpack-3.2.0.rc1.gemspec'
  </code></pre>
  
  <p>my gemfile is as follows:</p>
  
  <pre><code>source 'https://rubygems.org'
  
  gem 'rails', '3.2.0.rc1'
  
  
  # Bundle edge Rails instead:
  # gem 'rails', :git =&gt; 'git://github.com/rails/rails.git'
  
  gem 'mysql2'
  
  
  
  # Gems used only for assets and not required
  # in production environments by default.
  group :assets do
    gem 'sass-rails',   '~&gt; 3.2.0'
    gem 'coffee-rails', '~&gt; 3.2.0'
  
    #gem 'uglifier', '&gt;= 1.0.3'
  end
  
  gem 'jquery-rails'
  
  
  group :development do
    gem 'rspec-rails', '2.7.0'
    gem 'ZenTest', '4.6.2'
    gem 'autotest-growl'
    gem 'autotest-fsevent'
    gem 'webrat', '0.7.3'
  end
  
  group :test do
    gem 'rspec', '2.7.0'
    gem 'webrat', '0.7.3'
  end 
  </code></pre>
  
  <p>I am having trouble debugging the issue and looked through almost all of the rails/heroku posts I could find but nothing on this specific issue.  I was looking for some help...apologies if this is something quite basic.</p>
  
  <p>I should also mention that the app works fine on my local machine and here is my database information (I am using mysql). Here is the DB info.</p>
  
  <pre><code># MySQL.  Versions 4.1 and 5.0 are recommended.
  # 
  # Install the MYSQL driver
  #   gem install mysql2
  #
  # Ensure the MySQL gem is defined in your Gemfile
  #   gem 'mysql2'
  #
  # And be sure to use new-style password hashing:
  #   http://dev.mysql.com/doc/refman/5.0/en/old-client.html
  development:
    adapter: mysql2
    encoding: utf8
    reconnect: false
    database: sample_app_development
    pool: 5
    username: root
    password:
    socket: /tmp/mysql.sock
  
  # Warning: The database defined as "test" will be erased and
  # re-generated from your development database when you run "rake".
  # Do not set this db to the same as development or production.
  test:
    adapter: mysql2
    encoding: utf8
    reconnect: false
    database: sample_app_test
    pool: 5
    username: root
    password:
    socket: /tmp/mysql.sock
  
  production:
    adapter: mysql2
    encoding: utf8
    reconnect: false
    database: sample_app_production
    pool: 5
    username: root
    password:
    socket: /tmp/mysql.sock
  </code></pre>
  
  <p>Thanks!</p>