Codeigniter 无法访问与字段名captcha对应的错误消息。（captchacheck）

我使用了这里找到的解决方案。它在Mac上运行于我的CI 3.0，但是当我尝试将该站点部署到我的Ubuntu服务器时，它会生成“无法访问与您的域名captcha（captchacheck）对应的错误消息”。 请帮忙

谢谢

function index(){
  $this->load->library('form_validation');
  $this->form_validation->set_rules('username', 'User Name', 'trim|required|min_length[4]|xss_clean');
  $this->form_validation->set_rules('firstname', 'First Name', 'trim|required|min_length[4]|xss_clean');
  $this->form_validation->set_rules('lastname', 'Last Name', 'trim|required|min_length[4]|xss_clean');
  $this->form_validation->set_rules('email', 'Your Email', 'trim|required|valid_email');
  $this->form_validation->set_rules('password', 'Password', 'trim|required|min_length[4]|max_length[32]');
  $this->form_validation->set_rules('password2', 'Password Confirmation', 'trim|required|matches[password]');
  $this->form_validation->set_rules('country', 'Country', 'trim|required|min_length[4]|xss_clean');
  $this->form_validation->set_rules('company', 'Company', 'trim|required|min_length[4]|xss_clean');
  $this->form_validation->set_rules('captcha', 'captcha', 'trim|strip_tags|callback_captcha_check|match_captcha[captcha.word]');
  $data = $this->get_data_from_post();
    if ($this->form_validation->run($this) === false){
       $data['image'] = $this->captcha_model->create_image();
       $data['view_file'] = 'registration';
       $data['js']="";
       $data['module'] = 'users';
       $this->load->module('template');
       $this->template->site($data); 
    }
    else{
       $data2 = $this->get_data_from_post();
       $this->db->insert('ict_users',$data2);
       $data['view_file'] = 'success';
       $data['js']="";
       $data['module'] = 'users';
       $this->load->module('template');
       $this->template->site($data); 
    } 
}

function captcha_check($value){
    if($value==''){
        $this->form_validation->set_message('captcha_check','Please enter the text from the image');
        return false;
    }
    else{
        return true;

    }
}

---

@user1372324我忘了提到我已经扩展了表单验证，我在该类中包含了match_captcha函数：den try put$this->form_validation->set_message（'captcha_check'，'Please enter the text from the image'）；下面$this->form_validation->set_rules（'captcha'，'captcha'，'trim | strip_tags | callback | captcha_check | match_captcha[captcha.word]）；

Please remove 
match_captcha[captcha.word]
You need to use a callback for it below given

public function validate_captcha(){
    if($this->input->post('captcha') != $this->session->userdata['captcha'])
    {
        $this->form_validation->set_message('validate_captcha', 'Wrong captcha code, hmm are you the Terminator?');
        return false;
    }else{
        return true;
    }

}