Yii登陆时的验证码的图片出不来!!

view:




 <?php if(CCaptcha::checkRequirements()): ?>

        <div class="row">

                <?php echo $form->labelEx($model,'verifyCode'); ?>

                <div>

                <?php $this->widget('CCaptcha'); ?>

                <?php echo $form->textField($model,'verifyCode'); ?>

                </div>

                <div class="hint">Please enter the letters as they are shown in the image above.

                <br/>Letters are not case-sensitive.</div>

                <?php echo $form->error($model,'verifyCode'); ?>

        </div>

        <?php endif; ?>



controller:siteController




 public function actions()

    {

        return array(

            // captcha action renders the CAPTCHA image displayed on the contact page

            'captcha' => array(

                'class' => 'CCaptchaAction',

                'backColor' => 0xFFFFFF,

                'maxLength'=>'4',      

                'minLength'=>'2',

            ),

            // page action renders "static" pages stored under 'protected/views/site/pages'

            // They can be accessed via: index.php?r=site/page&view=FileName

            'page' => array(

                'class' => 'CViewAction',

            ),

        );

    }



model :LoginForm





    public $username;

    public $password;

    public $rememberMe;

    public $verifyCode;

    private $_identity;

  public function rules()

    {

        return array(

            // username and password are required

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

            array('username','required','message'=>'用户名不能为空!'),

            array('password','required','message'=>'密码不能为空!'),

            // rememberMe needs to be a boolean

            array('rememberMe', 'boolean'),

            // password needs to be authenticated

            array('password', 'authenticate'),

            //verifyCode validation

            array('verifyCode', 'captcha', 'allowEmpty' => !CCaptcha::checkRequirements()),

        );

    }



直接访问admin.php?r=site/captcha 页面显示 “图像因其本身有错无法显示”。

请问这是咋回事??

我加了rights模块