照着文档restful那章弄的，报错了，求帮助 [ 2.0 版本 ]

<response>
<name>PHP Fatal Error</name>
<message>Call to undefined method app\models\User::find()</message>
<code>1</code>
<type>yii\base\ErrorException</type>
<file>
/var/www/yii_basic/vendor/yiisoft/yii2/rest/IndexAction.php
</file>
<line>61</line>
<stack-trace>
<item>
#0 [internal function]: yii\base\ErrorHandler->handleFatalError()
</item>
<item>#1 {main}</item>
</stack-trace>
</response>