title: trouble pushing to heroku using rails app
body: <p>help would be much appreciated. for some reason, my push to heroku does not work even though my local version is working fine.</p>
  
  <p>i'm deploying a rails app.</p>
  
  <p>after a git push heroku, and heroku run rake db:migrate i get an application error on my website. </p>
  
  <p><em>EDIT</em> i put up the entire back trace</p>
  
  <pre><code>2012-03-13T20:49:20+00:00 app[web.1]:   from 
  
  /app/vendor/bundle/ruby/1.9.1/gems/rack-1.4.1/lib/rack/server.rb:200:in `app'
  2012-03-13T20:49:20+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/rack-1.4.1/lib/rack/builder.rb:40:in `parse_file'
  2012-03-13T20:49:20+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.1/lib/rails/commands/server.rb:46:in `app'
  2012-03-13T20:49:20+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/rack-1.4.1/lib/rack/server.rb:301:in `wrapped_app'
  2012-03-13T20:49:20+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.1/lib/rails/commands/server.rb:70:in `start'
  2012-03-13T20:49:20+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/rack-1.4.1/lib/rack/server.rb:252:in `start'
  2012-03-13T20:49:20+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.1/lib/rails/commands.rb:55:in `block in &lt;top (required)&gt;'
  2012-03-13T20:49:20+00:00 app[web.1]:   from script/rails:6:in `require'
  2012-03-13T20:49:20+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.1/lib/rails/commands.rb:50:in `tap'
  2012-03-13T20:49:20+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.1/lib/rails/commands.rb:50:in `&lt;top (required)&gt;'
  2012-03-13T20:49:20+00:00 app[web.1]:   from script/rails:6:in `&lt;main&gt;'
  2012-03-13T20:49:21+00:00 heroku[web.1]: Process exited with status 1
  2012-03-13T20:49:21+00:00 heroku[web.1]: State changed from starting to crashed
  2012-03-13T21:01:36+00:00 heroku[router]: Error H10 (App crashed) -&gt; GET strong-sunrise-8468.herokuapp.com/ dyno= queue= wait= service= status=503 bytes=
  2012-03-13T21:03:43+00:00 heroku[web.1]: State changed from crashed to created
  2012-03-13T21:03:43+00:00 heroku[web.1]: State changed from created to starting
  2012-03-13T21:03:47+00:00 heroku[web.1]: Starting process with command `bundle exec rails server -p 43183`
  2012-03-13T21:03:50+00:00 app[web.1]: DEPRECATION WARNING: You have Rails 2.3-style plugins in vendor/plugins! Support for these plugins will be removed in Rails 4.0. Move them out and bundle them in your Gemfile, or fold them in to your app as lib/myplugin/* and config/initializers/myplugin.rb. See the release notes for more on this: http://weblog.rubyonrails.org/2012/01/04/rails-3-2-0-rc2-has-been-released. (called from &lt;top (required)&gt; at /app/config/environment.rb:5)
  2012-03-13T21:03:50+00:00 app[web.1]: DEPRECATION WARNING: You have Rails 2.3-style plugins in vendor/plugins! Support for these plugins will be removed in Rails 4.0. Move them out and bundle them in your Gemfile, or fold them in to your app as lib/myplugin/* and config/initializers/myplugin.rb. See the release notes for more on this: http://weblog.rubyonrails.org/2012/01/04/rails-3-2-0-rc2-has-been-released. (called from &lt;top (required)&gt; at /app/config/environment.rb:5)
  2012-03-13T21:03:53+00:00 app[web.1]: =&gt; Booting WEBrick
  2012-03-13T21:03:53+00:00 app[web.1]: =&gt; Rails 3.2.1 application starting in production on http://0.0.0.0:43183
  2012-03-13T21:03:53+00:00 app[web.1]: =&gt; Call with -d to detach
  2012-03-13T21:03:53+00:00 app[web.1]: =&gt; Ctrl-C to sh
  
  2012-03-13T21:03:53+00:00 app[web.1]: Exiting
  2012-03-13T21:03:53+00:00 app[web.1]: /app/vendor/bundle/ruby/1.9.1/gems/bundler-1.1.rc.7/lib/bundler/rubygems_integration.rb:147:in `block in replace_gem': bcrypt-ruby is not part of the bundle. Add it to Gemfile. (Gem::LoadError)
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/activemodel-3.2.1/lib/active_model/secure_password.rb:37:in `has_secure_password'
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/app/models/user.rb:14:in `&lt;class:User&gt;'
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/app/models/user.rb:12:in `&lt;top (required)&gt;'
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.1/lib/active_support/dependencies.rb:251:in `require'
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.1/lib/active_support/dependencies.rb:251:in `block in require'
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.1/lib/active_support/dependencies.rb:236:in `load_dependency'
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.1/lib/active_support/dependencies.rb:251:in `require'
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.1/lib/active_support/dependencies.rb:359:in `require_or_load'
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.1/lib/active_support/dependencies.rb:502:in `load_missing_constant'
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.1/lib/active_support/dependencies.rb:192:in `block in const_missing'
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.1/lib/active_support/dependencies.rb:190:in `each'
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.1/lib/active_support/inflector/methods.rb:228:in `each'
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.1/lib/active_support/dependencies.rb:190:in `const_missing'
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.1/lib/active_support/inflector/methods.rb:228:in `constantize'
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.1/lib/active_support/inflector/methods.rb:229:in `block in constantize'
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.1/lib/active_support/inflector/methods.rb:259:in `safe_constantize'
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.1/lib/active_support/core_ext/string/inflections.rb:66:in `safe_constantize'
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.1/lib/action_controller/metal/params_wrapper.rb:152:in `_default_wrap_model'
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.1/lib/action_controller/metal/params_wrapper.rb:169:in `_set_wrapper_defaults'
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.1/lib/action_controller/metal/params_wrapper.rb:133:in `inherited'
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.1/lib/abstract_controller/railties/routes_helpers.rb:7:in `block (2 levels) in with'
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/app/controllers/users_controller.rb:1:in `&lt;top (required)&gt;'
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.1/lib/action_controller/railties/paths.rb:7:in `block (2 levels) in with'
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.1/lib/active_support/dependencies.rb:251:in `require'
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.1/lib/active_support/dependencies.rb:251:in `block in require'
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.1/lib/active_support/dependencies.rb:251:in `require'
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.1/lib/active_support/dependencies.rb:236:in `load_dependency'
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.1/lib/active_support/dependencies.rb:359:in `require_or_load'
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.1/lib/active_support/dependencies.rb:313:in `depend_on'
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.1/lib/active_support/dependencies.rb:225:in `require_dependency'
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.1/lib/rails/engine.rb:439:in `block (2 levels) in eager_load!'
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.1/lib/rails/engine.rb:438:in `each'
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.1/lib/rails/engine.rb:438:in `block in eager_load!'
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.1/lib/rails/engine.rb:436:in `each'
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.1/lib/rails/engine.rb:436:in `eager_load!'
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.1/lib/rails/application/finisher.rb:53:in `block in &lt;module:Finisher&gt;'
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.1/lib/rails/initializable.rb:30:in `instance_exec'
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.1/lib/rails/initializable.rb:30:in `run'
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/vendor
  
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.1/lib/rails/initializable.rb:54:in `each'
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.1/lib/rails/initializable.rb:54:in `run_initializers'
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.1/lib/rails/application.rb:136:in `initialize!'
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.1/lib/rails/railtie/configurable.rb:30:in `method_missing'
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/config/environment.rb:5:in `&lt;top (required)&gt;'
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/config.ru:4:in `require'
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/config.ru:4:in `block in &lt;main&gt;'
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/rack-1.4.1/lib/rack/builder.rb:51:in `instance_eval'
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/rack-1.4.1/lib/rack/builder.rb:51:in `initialize'
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/config.ru:1:in `new'
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/config.ru:1:in `&lt;main&gt;'
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/rack-1.4.1/lib/rack/builder.rb:40:in `eval'
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/rack-1.4.1/lib/rack/builder.rb:40:in `parse_file'
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/rack-1.4.1/lib/rack/server.rb:200:in `app'
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.1/lib/rails/commands/server.rb:46:in `app'
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/rack-1.4.1/lib/rack/server.rb:301:in `wrapped_app'
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/rack-1.4.1/lib/rack/server.rb:252:in `start'
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.1/lib/rails/commands/server.rb:70:in `start'
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.1/lib/rails/commands.rb:55:in `block in &lt;top (required)&gt;'
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.1/lib/rails/commands.rb:50:in `tap'
  2012-03-13T21:03:53+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.1/lib/rails/commands.rb:50:in `&lt;top (required)&gt;'
  2012-03-13T21:03:53+00:00 app[web.1]:   from script/rails:6:in `require'
  2012-03-13T21:03:53+00:00 app[web.1]:   from script/rails:6:in `&lt;main&gt;'
  2012-03-13T21:03:54+00:00 heroku[web.1]: Process exited with status 1
  2012-03-13T21:03:54+00:00 heroku[web.1]: State changed from starting to crashed
  2012-03-13T21:04:38+00:00 heroku[run.1]: State changed from created to starting
  2012-03-13T21:04:44+00:00 app[run.1]: Awaiting client
  2012-03-13T21:04:45+00:00 heroku[run.1]: Process exited with status 0
  2012-03-13T21:04:45+00:00 heroku[run.1]: State changed from starting to complete
  2012-03-13T21:04:52+00:00 heroku[run.1]: State changed from created to starting
  2012-03-13T21:04:58+00:00 app[run.1]: Awaiting client
  2012-03-13T21:04:58+00:00 app[run.1]: Starting process with command `bundle exec rake db:migrate`
  2012-03-13T21:04:59+00:00 heroku[run.1]: State changed from starting to up
  2012-03-13T21:05:04+00:00 heroku[run.1]: Process exited with status 0
  2012-03-13T21:05:04+00:00 heroku[run.1]: State changed from up to complete
  2012-03-13T21:05:21+00:00 heroku[router]: Error H10 (App crashed) -&gt; GET strong-sunrise-8468.herokuapp.com/ dyno= queue= wait= service= status=503 bytes=
  </code></pre>
  
  <p>i notice there are deprecation warnings, but im following the michael hartl book for beginners learning rails and he said to ignore them.</p>
  
  <p>i did </p>
  
  <pre><code>heroku stack
  </code></pre>
  
  <p>and i am on the cedar stack as well</p>
  
  <p>inside the environment.rb, the contents are...</p>
  
  <pre><code>1. # Load the rails application
  2. require File.expand_path('../application', __FILE__)
  3. 
  4. # Initialize the rails application
  5. SampleApp::Application.initialize!
  </code></pre>