title: Rails Command won't work, Building web app
body: <p>The following text comes up each time I run <code>rails s</code> in my terminal. </p>
  
  <pre><code>yonas@yonas:~/Documents/code/MCtut/commandsapp$ rails s
  =&gt; Booting WEBrick
  =&gt; Rails 4.2.0 application starting in development on http://localhost:3000
  =&gt; Run `rails server -h` for more startup options
  =&gt; Ctrl-C to shutdown server
  Exiting
  /home/yonas/Documents/code/MCtut/commandsapp/config/initializers/devise.rb:3:in `&lt;top (required)&gt;': uninitialized constant Devise (NameError)
    from /usr/local/lib/ruby/gems/2.1.0/gems/railties-4.2.0/lib/rails/engine.rb:652:in `block in load_config_initializer'
    from /usr/local/lib/ruby/gems/2.1.0/gems/activesupport-4.2.0/lib/active_support/notifications.rb:166:in `instrument'
    from /usr/local/lib/ruby/gems/2.1.0/gems/railties-4.2.0/lib/rails/engine.rb:651:in `load_config_initializer'
    from /usr/local/lib/ruby/gems/2.1.0/gems/railties-4.2.0/lib/rails/engine.rb:616:in `block (2 levels) in &lt;class:Engine&gt;'
    from /usr/local/lib/ruby/gems/2.1.0/gems/railties-4.2.0/lib/rails/engine.rb:615:in `each'
    from /usr/local/lib/ruby/gems/2.1.0/gems/railties-4.2.0/lib/rails/engine.rb:615:in `block in &lt;class:Engine&gt;'
    from /usr/local/lib/ruby/gems/2.1.0/gems/railties-4.2.0/lib/rails/initializable.rb:30:in `instance_exec'
    from /usr/local/lib/ruby/gems/2.1.0/gems/railties-4.2.0/lib/rails/initializable.rb:30:in `run'
    from /usr/local/lib/ruby/gems/2.1.0/gems/railties-4.2.0/lib/rails/initializable.rb:55:in `block in run_initializers'
    from /usr/local/lib/ruby/2.1.0/tsort.rb:226:in `block in tsort_each'
    from /usr/local/lib/ruby/2.1.0/tsort.rb:348:in `block (2 levels) in each_strongly_connected_component'
    from /usr/local/lib/ruby/2.1.0/tsort.rb:418:in `block (2 levels) in each_strongly_connected_component_from'
    from /usr/local/lib/ruby/2.1.0/tsort.rb:427:in `each_strongly_connected_component_from'
    from /usr/local/lib/ruby/2.1.0/tsort.rb:417:in `block in each_strongly_connected_component_from'
    from /usr/local/lib/ruby/gems/2.1.0/gems/railties-4.2.0/lib/rails/initializable.rb:44:in `each'
    from /usr/local/lib/ruby/gems/2.1.0/gems/railties-4.2.0/lib/rails/initializable.rb:44:in `tsort_each_child'
    from /usr/local/lib/ruby/2.1.0/tsort.rb:411:in `call'
    from /usr/local/lib/ruby/2.1.0/tsort.rb:411:in `each_strongly_connected_component_from'
    from /usr/local/lib/ruby/2.1.0/tsort.rb:347:in `block in each_strongly_connected_component'
    from /usr/local/lib/ruby/2.1.0/tsort.rb:345:in `each'
    from /usr/local/lib/ruby/2.1.0/tsort.rb:345:in `call'
    from /usr/local/lib/ruby/2.1.0/tsort.rb:345:in `each_strongly_connected_component'
    from /usr/local/lib/ruby/2.1.0/tsort.rb:224:in `tsort_each'
    from /usr/local/lib/ruby/2.1.0/tsort.rb:205:in `tsort_each'
    from /usr/local/lib/ruby/gems/2.1.0/gems/railties-4.2.0/lib/rails/initializable.rb:54:in `run_initializers'
    from /usr/local/lib/ruby/gems/2.1.0/gems/railties-4.2.0/lib/rails/application.rb:352:in `initialize!'
    from /home/yonas/Documents/code/MCtut/commandsapp/config/environment.rb:5:in `&lt;top (required)&gt;'
    from /home/yonas/Documents/code/MCtut/commandsapp/config.ru:3:in `require'
    from /home/yonas/Documents/code/MCtut/commandsapp/config.ru:3:in `block in &lt;main&gt;'
    from /usr/local/lib/ruby/gems/2.1.0/gems/rack-1.6.0/lib/rack/builder.rb:55:in `instance_eval'
    from /usr/local/lib/ruby/gems/2.1.0/gems/rack-1.6.0/lib/rack/builder.rb:55:in `initialize'
    from /home/yonas/Documents/code/MCtut/commandsapp/config.ru:in `new'
    from /home/yonas/Documents/code/MCtut/commandsapp/config.ru:in `&lt;main&gt;'
    from /usr/local/lib/ruby/gems/2.1.0/gems/rack-1.6.0/lib/rack/builder.rb:49:in `eval'
    from /usr/local/lib/ruby/gems/2.1.0/gems/rack-1.6.0/lib/rack/builder.rb:49:in `new_from_string'
    from /usr/local/lib/ruby/gems/2.1.0/gems/rack-1.6.0/lib/rack/builder.rb:40:in `parse_file'
    from /usr/local/lib/ruby/gems/2.1.0/gems/rack-1.6.0/lib/rack/server.rb:299:in `build_app_and_options_from_config'
    from /usr/local/lib/ruby/gems/2.1.0/gems/rack-1.6.0/lib/rack/server.rb:208:in `app'
    from /usr/local/lib/ruby/gems/2.1.0/gems/railties-4.2.0/lib/rails/commands/server.rb:61:in `app'
    from /usr/local/lib/ruby/gems/2.1.0/gems/rack-1.6.0/lib/rack/server.rb:336:in `wrapped_app'
    from /usr/local/lib/ruby/gems/2.1.0/gems/railties-4.2.0/lib/rails/commands/server.rb:139:in `log_to_stdout'
    from /usr/local/lib/ruby/gems/2.1.0/gems/railties-4.2.0/lib/rails/commands/server.rb:78:in `start'
    from /usr/local/lib/ruby/gems/2.1.0/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:80:in `block in server'
    from /usr/local/lib/ruby/gems/2.1.0/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:75:in `tap'
    from /usr/local/lib/ruby/gems/2.1.0/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:75:in `server'
    from /usr/local/lib/ruby/gems/2.1.0/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:39:in `run_command!'
    from /usr/local/lib/ruby/gems/2.1.0/gems/railties-4.2.0/lib/rails/commands.rb:17:in `&lt;top (required)&gt;'
    from bin/rails:4:in `require'
    from bin/rails:4:in `&lt;main&gt;'
  </code></pre>