title: Fatal error: Class 'Controller' not found CodeIgniter 2.2.0
body: <p>Hi developers, 
                I wants print "HelloWorld" in <strong>codeigniter</strong>.</p>
  
  <pre><code>&lt;?php
  
  Class Helloworld extends Controller {
  
      public function Helloworld()
      {
          parent::Controller();
      }
  
      function hello() 
      {
          $this-&gt;load-&gt;view('helloworld');
      }
  }
  </code></pre>