php - file upload not working - Codeigniter -


i have tried upload image it's not working, before adding upload section code working , entries form stored in database form text field not working..

controller-
have tried below code.but not working.please me solve this?

public function index(){                             // if(!$this->session->userdata('logged_in')){                             //  redirect('register/login');                             // }                             $this->form_validation->set_rules('name', 'name', 'required');                             $this->form_validation->set_rules('location', 'location', 'required');                             $this->form_validation->set_rules('dob', 'dob', 'required');                             $this->form_validation->set_rules('height', 'height', 'required');                             $this->form_validation->set_rules('weight', 'weight', 'required');                             $this->form_validation->set_rules('optselect', 'complexion', 'required');                             $this->form_validation->set_rules('email', 'email exists.', 'required');                              if($this->form_validation->run() === false){                                  $this->load->view('templates/pheader');                                 $this->load->view('profile/aboutme');                                 $this->load->view('templates/pfooter');                             } else {                                 //upload image                                 $path = './assets/uploads/profilepic';                                 $config['upload_path'] = $path;                                 $config['allowed_types'] = 'gif|jpg|png';                                 $config['max_size'] = 15000;                                 $config['max_width'] = 1920;                                 $config['max_height'] = 1080;                                  $this->load->library('upload', $config);                                  if(!$this->upload->do_upload()){                                     echo "lol";                                     echo $this->upload->display_errors();                                     $this->session->set_flashdata('file_error', $this->upload->display_errors());                                     $post_image = 'noimage.jpg';                                     exit();                                 }else{                                     $data = array('upload_data' => $this->upload->data());                                     $post_image = $_files['userfile']['name'];                                 }                                  $this->profile_model->about($post_image);                                 redirect('profile/vabout');                             }                         }

view-

                         <div class="form-group">                             <label class="col-md-3 text-right">upload profile pic:</label>                             <div class="col-md-9">                             <input type="file" name="userfile" id="userfile" size="20" />                             </div>                     </div>

model-

public function about($post_image){                         $data = array(                                 'name' => $this->input->post('name'),                                 'location'=>$this->input->post('location'),                                                  'dob' => $this->input->post('dob'),                                 'optradio' => $this->input->post('optradio'),                                 'height'=>$this->input->post('height'),                                 'weight'=>$this->input->post('weight'),                                 'optselect'=>$this->input->post('optselect'),                                 'email' => $this->input->post('email'),                                 'web'=>$this->input->post('web'),                                 'awards'=>$this->input->post('awards'),                                 'cw'=>$this->input->post('cw'),                                 'pp'=>$this->input->post('pp'),                                 'youtube'=>$this->input->post('youtube'),                                 'fb'=>$this->input->post('fb'),                                 'ld'=>$this->input->post('ld'),                                 'tw'=>$this->input->post('tw'),                                 'insta'=>$this->input->post('insta'),                                 'image'=> $post_image                             );                          return $this->db->insert('profile', $data);                     }

try this

<form enctype="multipart/form-data" method="post" >

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