(Ubuntu) When I run “rails server” it runs, but then exits and gives me a bunch of what I presume are error messages

Question

I am fairly new to Ubuntu and Programming and working with terminals and after searching for quite a while I couldn't find any information on my problem or I couldn't think of what to search exactly and so I thought posting my own question would help because most of the errors that I saw other people having were much shorter and were different even though they both started out the same way with the rails server running for a second or two and then exiting, then outputting errors. Any help of appreciated.

Code that I ran:

root@KyleBuntu:~/Desktop/Rails/first_app# rails server
>=> Booting WEBrick
>=> Rails 4.0.8 application starting in development on http://0.0.0.0:3000
>=> Run `rails server -h` for more startup options
>=> Ctrl-C to shutdown server
>Exiting
>/home/verendus/Desktop/Rails/first_app/config/environments/development.rb:1:in `<top (required)>': undefined method `configure' for #<FirstApp::Application:0x00000002e01dc8> (NoMethodError)
>   from /home/verendus/.rvm/gems/ruby-2.0.0-p481/gems/activesupport-4.0.8/lib/active_support/dependencies.rb:229:in `require'
>   from /home/verendus/.rvm/gems/ruby-2.0.0-p481/gems/activesupport-4.0.8/lib/active_support/dependencies.rb:229:in `block in require'
>   from /home/verendus/.rvm/gems/ruby-2.0.0-p481/gems/activesupport-4.0.8/lib/active_support/dependencies.rb:214:in `load_dependency'
>   from /home/verendus/.rvm/gems/ruby-2.0.0-p481/gems/activesupport-4.0.8/lib/active_support/dependencies.rb:229:in `require'
>   from /home/verendus/.rvm/gems/ruby-2.0.0-p481/gems/railties-4.0.8/lib/rails/engine.rb:591:in `block (2 levels) in <class:Engine>'
>   from /home/verendus/.rvm/gems/ruby-2.0.0-p481/gems/railties-4.0.8/lib/rails/engine.rb:590:in `each'
>   from /home/verendus/.rvm/gems/ruby-2.0.0-p481/gems/railties-4.0.8/lib/rails/engine.rb:590:in `block in <class:Engine>'
>   from /home/verendus/.rvm/gems/ruby-2.0.0-p481/gems/railties-4.0.8/lib/rails/initializable.rb:30:in `instance_exec'
>   from /home/verendus/.rvm/gems/ruby-2.0.0-p481/gems/railties-4.0.8/lib/rails/initializable.rb:30:in `run'
>   from /home/verendus/.rvm/gems/ruby-2.0.0-p481/gems/railties-4.0.8/lib/rails/initializable.rb:55:in `block in run_initializers'
>   from /home/verendus/.rvm/rubies/ruby-2.0.0-p481/lib/ruby/2.0.0/tsort.rb:150:in `block in tsort_each'
>   from /home/verendus/.rvm/rubies/ruby-2.0.0-p481/lib/ruby/2.0.0/tsort.rb:183:in `block (2 levels) in each_strongly_connected_component'
>   from /home/verendus/.rvm/rubies/ruby-2.0.0-p481/lib/ruby/2.0.0/tsort.rb:210:in `block (2 levels) in each_strongly_connected_component_from'
>   from /home/verendus/.rvm/rubies/ruby-2.0.0-p481/lib/ruby/2.0.0/tsort.rb:219:in `each_strongly_connected_component_from'
>   from /home/verendus/.rvm/rubies/ruby-2.0.0-p481/lib/ruby/2.0.0/tsort.rb:209:in `block in each_strongly_connected_component_from'
>   from /home/verendus/.rvm/gems/ruby-2.0.0-p481/gems/railties-4.0.8/lib/rails/initializable.rb:44:in `each'
>   from /home/verendus/.rvm/gems/ruby-2.0.0-p481/gems/railties-4.0.8/lib/rails/initializable.rb:44:in `tsort_each_child'
>   from /home/verendus/.rvm/rubies/ruby-2.0.0-p481/lib/ruby/2.0.0/tsort.rb:203:in `each_strongly_connected_component_from'
>   from /home/verendus/.rvm/rubies/ruby-2.0.0-p481/lib/ruby/2.0.0/tsort.rb:182:in `block in each_strongly_connected_component'
>   from /home/verendus/.rvm/rubies/ruby-2.0.0-p481/lib/ruby/2.0.0/tsort.rb:180:in `each'
>   from /home/verendus/.rvm/rubies/ruby-2.0.0-p481/lib/ruby/2.0.0/tsort.rb:180:in `each_strongly_connected_component'
>   from /home/verendus/.rvm/rubies/ruby-2.0.0-p481/lib/ruby/2.0.0/tsort.rb:148:in `tsort_each'
>   from /home/verendus/.rvm/gems/ruby-2.0.0-p481/gems/railties-4.0.8/lib/rails/initializable.rb:54:in `run_initializers'
>   from /home/verendus/.rvm/gems/ruby-2.0.0-p481/gems/railties-4.0.8/lib/rails/application.rb:215:in `initialize!'
>   from /home/verendus/Desktop/Rails/first_app/config/environment.rb:5:in `<top (required)>'
>   from /home/verendus/Desktop/Rails/first_app/config.ru:3:in `require'
>   from /home/verendus/Desktop/Rails/first_app/config.ru:3:in `block in <main>'
>   from /home/verendus/.rvm/gems/ruby-2.0.0-p481/gems/rack-1.5.2/lib/rack/builder.rb:55:in `instance_eval'
>   from /home/verendus/.rvm/gems/ruby-2.0.0-p481/gems/rack-1.5.2/lib/rack/builder.rb:55:in `initialize'
>   from /home/verendus/Desktop/Rails/first_app/config.ru:in `new'
>   from /home/verendus/Desktop/Rails/first_app/config.ru:in `<main>'
>   from /home/verendus/.rvm/gems/ruby-2.0.0-p481/gems/rack-1.5.2/lib/rack/builder.rb:49:in `eval'
>   from /home/verendus/.rvm/gems/ruby-2.0.0-p481/gems/rack-1.5.2/lib/rack/builder.rb:49:in `new_from_string'
>   from /home/verendus/.rvm/gems/ruby-2.0.0-p481/gems/rack-1.5.2/lib/rack/builder.rb:40:in `parse_file'
>   from /home/verendus/.rvm/gems/ruby-2.0.0-p481/gems/rack-1.5.2/lib/rack/server.rb:277:in `build_app_and_options_from_config'
>   from /home/verendus/.rvm/gems/ruby-2.0.0-p481/gems/rack-1.5.2/lib/rack/server.rb:199:in `app'
>   from /home/verendus/.rvm/gems/ruby-2.0.0-p481/gems/railties-4.0.8/lib/rails/commands/server.rb:48:in `app'
>   from /home/verendus/.rvm/gems/ruby-2.0.0-p481/gems/rack-1.5.2/lib/rack/server.rb:314:in `wrapped_app'
>   from /home/verendus/.rvm/gems/ruby-2.0.0-p481/gems/railties-4.0.8/lib/rails/commands/server.rb:75:in `start'
>   from /home/verendus/.rvm/gems/ruby-2.0.0-p481/gems/railties-4.0.8/lib/rails/commands.rb:76:in `block in <top (required)>'
>   from /home/verendus/.rvm/gems/ruby-2.0.0-p481/gems/railties-4.0.8/lib/rails/commands.rb:71:in `tap'
>   from /home/verendus/.rvm/gems/ruby-2.0.0-p481/gems/railties-4.0.8/lib/rails/commands.rb:71:in `<top (required)>'
>   from bin/rails:8:in `require'
>   from bin/rails:8:in `<main>'

If any information is needed then I can provide it. I am new to both Ubuntu and Programming so sorry if I have made some simple mistakes somewhere. Any help is much appreciated.

Config as per request:

Rails.application.configure do
  # Settings specified here will take precedence over those in config/application.rb.

  # In the development environment your application's code is reloaded on
  # every request. This slows down response time but is perfect for development
  # since you don't have to restart the web server when you make code changes.
  config.cache_classes = false

  # Do not eager load code on boot.
  config.eager_load = false

  # Show full error reports and disable caching.
  config.consider_all_requests_local       = true
  config.action_controller.perform_caching = false

  # Don't care if the mailer can't send.
  config.action_mailer.raise_delivery_errors = false

  # Print deprecation notices to the Rails logger.
  config.active_support.deprecation = :log

  # Raise an error on page load if there are pending migrations.
  config.active_record.migration_error = :page_load

  # Debug mode disables concatenation and preprocessing of assets.
  # This option may cause significant delays in view rendering with a large
  # number of complex assets.
  config.assets.debug = true

  # Adds additional error checking when serving assets at runtime.
  # Checks for improperly declared sprockets dependencies.
  # Raises helpful error messages.
  config.assets.raise_runtime_errors = true

  # Raises error for missing translations
  # config.action_view.raise_on_missing_translations = true
end

2nd try:

=> Booting WEBrick
=> Rails 4.0.8 application starting in development on http://0.0.0.0:3000
=> Run `rails server -h` for more startup options
=> Ctrl-C to shutdown server
Exiting
/home/verendus/Desktop/Rails/first_app/config/environments/development.rb:1:in `<top (required)>': undefined method `application' for FirstApp:Module (NoMethodError)
    from /home/verendus/.rvm/gems/ruby-2.0.0-p481/gems/activesupport-4.0.8/lib/active_support/dependencies.rb:229:in `require'
    from /home/verendus/.rvm/gems/ruby-2.0.0-p481/gems/activesupport-4.0.8/lib/active_support/dependencies.rb:229:in `block in require'
    from /home/verendus/.rvm/gems/ruby-2.0.0-p481/gems/activesupport-4.0.8/lib/active_support/dependencies.rb:214:in `load_dependency'
    from /home/verendus/.rvm/gems/ruby-2.0.0-p481/gems/activesupport-4.0.8/lib/active_support/dependencies.rb:229:in `require'
    from /home/verendus/.rvm/gems/ruby-2.0.0-p481/gems/railties-4.0.8/lib/rails/engine.rb:591:in `block (2 levels) in <class:Engine>'
    from /home/verendus/.rvm/gems/ruby-2.0.0-p481/gems/railties-4.0.8/lib/rails/engine.rb:590:in `each'
    from /home/verendus/.rvm/gems/ruby-2.0.0-p481/gems/railties-4.0.8/lib/rails/engine.rb:590:in `block in <class:Engine>'
    from /home/verendus/.rvm/gems/ruby-2.0.0-p481/gems/railties-4.0.8/lib/rails/initializable.rb:30:in `instance_exec'
    from /home/verendus/.rvm/gems/ruby-2.0.0-p481/gems/railties-4.0.8/lib/rails/initializable.rb:30:in `run'
    from /home/verendus/.rvm/gems/ruby-2.0.0-p481/gems/railties-4.0.8/lib/rails/initializable.rb:55:in `block in run_initializers'
    from /home/verendus/.rvm/rubies/ruby-2.0.0-p481/lib/ruby/2.0.0/tsort.rb:150:in `block in tsort_each'
    from /home/verendus/.rvm/rubies/ruby-2.0.0-p481/lib/ruby/2.0.0/tsort.rb:183:in `block (2 levels) in each_strongly_connected_component'
    from /home/verendus/.rvm/rubies/ruby-2.0.0-p481/lib/ruby/2.0.0/tsort.rb:210:in `block (2 levels) in each_strongly_connected_component_from'
    from /home/verendus/.rvm/rubies/ruby-2.0.0-p481/lib/ruby/2.0.0/tsort.rb:219:in `each_strongly_connected_component_from'
    from /home/verendus/.rvm/rubies/ruby-2.0.0-p481/lib/ruby/2.0.0/tsort.rb:209:in `block in each_strongly_connected_component_from'
    from /home/verendus/.rvm/gems/ruby-2.0.0-p481/gems/railties-4.0.8/lib/rails/initializable.rb:44:in `each'
    from /home/verendus/.rvm/gems/ruby-2.0.0-p481/gems/railties-4.0.8/lib/rails/initializable.rb:44:in `tsort_each_child'
    from /home/verendus/.rvm/rubies/ruby-2.0.0-p481/lib/ruby/2.0.0/tsort.rb:203:in `each_strongly_connected_component_from'
    from /home/verendus/.rvm/rubies/ruby-2.0.0-p481/lib/ruby/2.0.0/tsort.rb:182:in `block in each_strongly_connected_component'
    from /home/verendus/.rvm/rubies/ruby-2.0.0-p481/lib/ruby/2.0.0/tsort.rb:180:in `each'
    from /home/verendus/.rvm/rubies/ruby-2.0.0-p481/lib/ruby/2.0.0/tsort.rb:180:in `each_strongly_connected_component'
    from /home/verendus/.rvm/rubies/ruby-2.0.0-p481/lib/ruby/2.0.0/tsort.rb:148:in `tsort_each'
    from /home/verendus/.rvm/gems/ruby-2.0.0-p481/gems/railties-4.0.8/lib/rails/initializable.rb:54:in `run_initializers'
    from /home/verendus/.rvm/gems/ruby-2.0.0-p481/gems/railties-4.0.8/lib/rails/application.rb:215:in `initialize!'
    from /home/verendus/Desktop/Rails/first_app/config/environment.rb:5:in `<top (required)>'
    from /home/verendus/Desktop/Rails/first_app/config.ru:3:in `require'
    from /home/verendus/Desktop/Rails/first_app/config.ru:3:in `block in <main>'
    from /home/verendus/.rvm/gems/ruby-2.0.0-p481/gems/rack-1.5.2/lib/rack/builder.rb:55:in `instance_eval'
    from /home/verendus/.rvm/gems/ruby-2.0.0-p481/gems/rack-1.5.2/lib/rack/builder.rb:55:in `initialize'
    from /home/verendus/Desktop/Rails/first_app/config.ru:in `new'
    from /home/verendus/Desktop/Rails/first_app/config.ru:in `<main>'
    from /home/verendus/.rvm/gems/ruby-2.0.0-p481/gems/rack-1.5.2/lib/rack/builder.rb:49:in `eval'
    from /home/verendus/.rvm/gems/ruby-2.0.0-p481/gems/rack-1.5.2/lib/rack/builder.rb:49:in `new_from_string'
    from /home/verendus/.rvm/gems/ruby-2.0.0-p481/gems/rack-1.5.2/lib/rack/builder.rb:40:in `parse_file'
    from /home/verendus/.rvm/gems/ruby-2.0.0-p481/gems/rack-1.5.2/lib/rack/server.rb:277:in `build_app_and_options_from_config'
    from /home/verendus/.rvm/gems/ruby-2.0.0-p481/gems/rack-1.5.2/lib/rack/server.rb:199:in `app'
    from /home/verendus/.rvm/gems/ruby-2.0.0-p481/gems/railties-4.0.8/lib/rails/commands/server.rb:48:in `app'
    from /home/verendus/.rvm/gems/ruby-2.0.0-p481/gems/rack-1.5.2/lib/rack/server.rb:314:in `wrapped_app'
    from /home/verendus/.rvm/gems/ruby-2.0.0-p481/gems/railties-4.0.8/lib/rails/commands/server.rb:75:in `start'
    from /home/verendus/.rvm/gems/ruby-2.0.0-p481/gems/railties-4.0.8/lib/rails/commands.rb:76:in `block in <top (required)>'
    from /home/verendus/.rvm/gems/ruby-2.0.0-p481/gems/railties-4.0.8/lib/rails/commands.rb:71:in `tap'
    from /home/verendus/.rvm/gems/ruby-2.0.0-p481/gems/railties-4.0.8/lib/rails/commands.rb:71:in `<top (required)>'
    from bin/rails:8:in `require'
    from bin/rails:8:in `<main>'

Answer 1

您只需要第一行说：

FirstApp.application.configure do

Answer 2

Please change following line in your application config/envrironments/development.rb file

From

FirstApp.application.configure

To

FirstApp::Application.configure

I also noticed that you have not added secret token yet.

Please run following command to generate secret token

rake secret

You need to copy secret token in new file in config/initializers/secret_token.rb

FirstApp::Application.config.secret_key_base = '<secret token generated>'

Your application will be up and running after that :)