新手请教表单验证问题

一桶浆糊

报错代码如下：A PHP Error was encounteredSeverity: Notice
Message: Undefined property: Cats:form_validation
Filename: controllers/cats.php
Line Number: 4
Fatal error: Call to a member function set_rules() on a non-object in F:\wamp\www\CI\application\controllers\cats.php on line 4

PHP复制代码

public function check_add(){    
  $this->load->helper(array('form', 'url'));
  $this->load->library('form_validation');
  $this->form_validation->set_rules('cname', '栏目名称', 'required');
  if ($this->form_validation->run() == FALSE)  {
     $this->load->view('admin/cats_add');
    }

复制代码

如果把第4行注释了，第5行的也开始报错，感觉像是'form_validation'这个文件没有被载入进来