Fatal Error when adding captcha with Form Builder

Yii 1.1 General Discussion
1

When trying to add captcha to the form builder the following error occures:

Fatal error: Method CForm::__toString() must not throw an exception in \protected\views\site\register.php on line 4

On line 4 is:

<?php echo $form; ?>

FORM BUILDER:

return array(

'elements'=&gt;array(


    'user'=&gt;array(


        'type'=&gt;'form',


        'title'=&gt;'Login information',


        'elements'=&gt;array(


            'username'=&gt;array('type'=&gt;'text'),


            'password'=&gt;array('type'=&gt;'password'),


            'email'=&gt;array('type'=&gt;'text'),


            Yii::app()-&gt;controller-&gt;widget(&quot;CCaptcha&quot;, array(), true),


            'capatcha' =&gt; array('type'=&gt;'text')


                'label' =&gt; Yii::t('form', 'Insert verification code'),


                'type' =&gt; 'text',


            )


        )


    ),


....................................


),





'buttons'=&gt;array(


    'register'=&gt;array(


        'type'=&gt;'submit',


        'label'=&gt;'Register'


    )


)

);

USER MODEL:

public function rules()

{


    return array(


        array('username, password, email', 'required'),


        array('username, password, email', 'length', 'max' =&gt; 128),


        array('email', 'email'),


        array('email', 'unique'),


        array('username', 'unique'),


        array('username, email', 'safe', 'on' =&gt; 'search'),


        array('capatcha', 'captcha', 'allowEmpty'=&gt;&#33;extension_loaded('gd'))


    );


}
2

I’ve temporarily solved my problem by adding

public $captcha;

to the User model