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Asked: 2026-06-14T11:55:52+00:00

I thought the problem was that I was using a SQLite3, so I migrated

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I thought the problem was that I was using a SQLite3, so I migrated to PostgreSQL but the problem persists. The app works fine locally. I open my app with heroku open, it gives me the following error:

Application Error. An error occurred in the application and your page could not be served. Please try again in a few moments. If you are the application owner, check your logs for details..

I tried to find the resolution by looking at the logs but failed, so I need someone’s help. Here are my logs and I appreciate any help!

2012-11-19T00:55:37+00:00 heroku[web.1]: Starting process with command `bundle exec thin start -R config.ru -e production -p 3545`
2012-11-19T00:55:39+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
the release notes for more on this: http://weblog.rubyonrails.org/2012/01/04/rails-3-2-0-rc2-has-been-released. (called from <top (required)> at /app/config/environment.rb:5)
2012-11-19T00:55:39+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
the release notes for more on this: http://weblog.rubyonrails.org/2012/01/04/rails-3-2-0-rc2-has-been-released. (called from <top (required)> at /app/config/environment.rb:5)
2012-11-19T00:55:41+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!'
2012-11-19T00:55:41+00:00 app[web.1]: /app/config/initializers/formtastic.rb:2:in `<top (required)>': uninitialized constant Formtastic (NameError)
2012-11-19T00:55:41+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.1/lib/rails/engine.rb:588:in `block (2 levels) in <class:Engine>'
2012-11-19T00:55:41+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'
2012-11-19T00:55:41+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.1/lib/rails/engine.rb:587:in `each'
2012-11-19T00:55:41+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.1/lib/rails/initializable.rb:55:in `block in run_initializers'
2012-11-19T00:55:41+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'
2012-11-19T00:55:41+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.1/lib/rails/engine.rb:587:in `block in <class:Engine>'
2012-11-19T00:55:41+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'
2012-11-19T00:55:41+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'
2012-11-19T00:55:41+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'
2012-11-19T00:55:41+00:00 app[web.1]:   from /app/config/environment.rb:5:in `<top (required)>'

2012-11-19T00:55:41+00:00 app[web.1]:   from config.ru:3:in `require'
2012-11-19T00:55:41+00:00 app[web.1]:   from config.ru:3:in `block in <main>'
2012-11-19T00:55:41+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'
2012-11-19T00:55:41+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'
2012-11-19T00:55:41+00:00 app[web.1]:   from config.ru:1:in `new'
2012-11-19T00:55:41+00:00 app[web.1]:   from config.ru:1:in `<main>'
2012-11-19T00:55:41+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/thin-1.5.0/lib/rack/adapter/loader.rb:33:in `eval'
2012-11-19T00:55:41+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/thin-1.5.0/lib/rack/adapter/loader.rb:33:in `load'
2012-11-19T00:55:41+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/thin-1.5.0/lib/thin/controllers/controller.rb:181:in `load_rackup_config'
2012-11-19T00:55:41+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/thin-1.5.0/lib/thin/runner.rb:187:in `run_command'
2012-11-19T00:55:41+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/thin-1.5.0/lib/thin/runner.rb:152:in `run!'
2012-11-19T00:55:41+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/thin-1.5.0/bin/thin:6:in `<top (required)>'
2012-11-19T00:55:41+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/bin/thin:19:in `load'

2012-11-19T00:55:41+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/bin/thin:19:in `<main>'
2012-11-19T00:55:41+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/thin-1.5.0/lib/thin/controllers/controller.rb:71:in `start'
2012-11-19T00:55:42+00:00 heroku[web.1]: Process exited with status 1
2012-11-19T00:56:34+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path=/ host=fast-savannah-6843.herokuapp.com fwd= dyno= queue= wait= connect= service= status=503 bytes=
2012-11-19T00:56:34+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path=/favicon.ico host=fast-savannah-6843.herokuapp.com fwd= dyno= queue= wait= connect= service= status=503 bytes=
2012-11-19T00:57:44+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path=/ host=fast-savannah-6843.herokuapp.com fwd= dyno= queue= wait= connect= service= status=503 bytes=
2012-11-19T00:57:44+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path=/favicon.ico host=fast-savannah-6843.herokuapp.com fwd= dyno= queue= wait= connect= service= status=503 bytes=
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1 Answer

  1. Editorial Team

    For first-time deployers, here are the problems I had, and how I solved them:

    1. RailsInstaller and Heroku Toolbelt are not perfectly compatible: If you encounter problems after you install Heroku toolbelt, I suggest you delete railsinstaller and heroku toolbelt alltogether, and install railsinstaller again. Then, in your gem file, simply add gem 'heroku' and run bundle install. I didn’t need any extra stuff to successfully deploy my app. Heroku Toolbelt installs ruby 1.9.2 v, and adds wrong path to your preference. You can choose to manually fix this PATH to the right location, ex) C:RailsInstaller:Ruby1.9.3 but I found it easier to reinstall everything.

    2. You have to migrate from SQLite3 to PostgreSQL: follow this if you are unsure how to do it.

    3. Follow Heroku tutorial to finally deploy your app: follow this. If you get errors that say something along line with “objects do not exist,” try running heroku run rake db:migrate.

    Good luck deploying!

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