title: how to fixed this Error 404 The system is unable to find the requested action "index"
body: <p>when i called controller then show Error 404 The system is unable to find the requested action "index".</p>
  
  <p>its Test controller file </p>
  
  <pre><code>class TestController extends Controller
  
  {
     public function actionLogin()
  {
      $model=new SignupForm();
      if(isset($_POST['SignupForm']))
     {
         // collects user input data
          $model-&gt;attributes=$_POST['SignupForm'];
          // validates user input and redirect to previous page if validated
          if($model-&gt;validate())
             $this-&gt;redirect(Yii::app()-&gt;user-&gt;returnUrl);
     }
      // displays the login form
      $this-&gt;render('index',array('model'=&gt;$model));
  }
    }
  </code></pre>
  
  <p>Its model File</p>
  
  <pre><code>class SignupForm extends CFormModel
    {
  
      public $username;
      public $password;
      public $rememberMe=false;
  
      public function rules()
      {
          return array(
              array('username, password', 'required'),
              array('rememberMe', 'boolean'),
              array('password', 'authenticate'),
          );
      }
  
      public function authenticate($attribute,$params)
      {
          $this-&gt;_identity=new UserIdentity($this-&gt;username,$this-&gt;password);
          if(!$this-&gt;_identity-&gt;authenticate())
              $this-&gt;addError('password','Incorrect username or password.');
      }
  
    }
  </code></pre>
  
  <p>When i called controller then show Error 404 The system is unable to find the requested action "index" so how to fixed this error </p>