yii2引入富文本编辑器redactor [ 2.0 版本 ]

下载好了，但是在view中写入代码就报错了
在view层：

<?= $form->field($model, 'content')->widget(\yii\redactor\widgets\Redactor::className(), [

'clientOptions' => [ 
    'imageManagerJson' => ['/redactor/upload/image-json'], 
    'imageUpload' => ['/redactor/upload/image'], 
    'fileUpload' => ['/redactor/upload/file'], 
    'lang' => 'zh_cn', 
    'plugins' => ['clips', 'fontcolor','imagemanager'] 
] 

]) ?>