php - Call to a member function result() on a non-object -

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there error message when view being loaded. "call member function result() on non-object"

how fix this?

this loop in view: discussion/view.php

<?php foreach ($query->result() $result) : ?>       <tr>         <td>           <?php echo anchor('comments/index/'.$result->ds_id,$result->ds_title) . ' '                 . $this->lang->line('comments_created_by') . $result->usr_name; ?>            <?php echo anchor('discussions/flag/'.$result->ds_id,           $this->lang->line('discussion_flag')) ; ?>           <br />           <?php echo $result->ds_body ; ?>         </td>       </tr>     <?php endforeach ; ?>

and function index in comments controller:

public function index() {         if ($this->input->post()) {             $ds_id = $this->input->post('ds_id');         } else {             $ds_id = $this->uri->segment(3);         }          $page_data['discussion_query'] = $this->discussions_model->fetch_discussion($ds_id);         $page_data['comment_query'] = $this->comments_model->fetch_comments($ds_id);         $page_data['ds_id'] = $ds_id;          $this->form_validation->set_rules('ds_id', $this->lang->line('comments_comment_hidden_id'), 'required|min_length[1]|max_length[11]');         $this->form_validation->set_rules('comment_name', $this->lang->line('comments_comment_name'), 'required|min_length[1]|max_length[25]');         $this->form_validation->set_rules('comment_email', $this->lang->line('comments_comment_email'), 'required|min_length[1]|max_length[255]');         $this->form_validation->set_rules('comment_body', $this->lang->line('comments_comment_body'), 'required|min_length[1]|max_length[5000]');          if ($this->form_validation->run() == false) {              $this->load->view('common/header');             $this->load->view('nav/top_nav');             $this->load->view('comments/view', $page_data);             $this->load->view('common/footer');         } else {             $data = array('cm_body' => $this->input->post('comment_body'),                           'usr_email' => $this->input->post('comment_email'),                           'usr_name' => $this->input->post('comment_name'),                           'ds_id' =>  $this->input->post('ds_id')                           );              if ($this->comments_model->new_comment($data)) {                 redirect('comments/index/'.$ds_id);             } else {                 // error                 $this->data['message'] = 'error!';             }         }     }


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