Fatal error: Call to a member function children() on a non-object in

代码：
 <?php
                      $data = array('siteNo'=>'sitefarther', 'publishTimeBegin'=>date("Y-m-d",strtotime("-7 day")), 'publishTimeEnd'=>date("Y-m-d"),'userNo'=>'000735','columnId'=>'19140902100016006');                       $data =