title: Action controller: Exception Caught while trying to acces recently generated controller on empty Ruby on Rails project
body: <p>I am new to ruby on rails, just trying to follow some tutorials.I just entered:</p>
  
  <pre><code>rails generate controller helloWorld index
  </code></pre>
  
  <p>then i started rails server and tried to access <a href="http://localhost:3000/hello_world/index" rel="nofollow">http://localhost:3000/hello_world/index</a>
  and got </p>
  
  <pre><code>Action controller: Exception Caught 
  
  ActiveRecord::ConnectionNotEstablished
  
  ActiveRecord::ConnectionNotEstablished
  </code></pre>
  
  <p>in the browser</p>