Image not uploading!

PHP Code:

<div class="custom-file">
                <input name="image" type="file" class="custom-file-input"  id="customFile">
                <label class="custom-file-label" for="customFile">Choose Image</label>
            </div> 


PHP Code:

public function create_blog() 
    {
        if (!isset($_POST['submit']))
        {
            $this->load->view('temp/header-short');
            $this->load->view('admin/create_blog');
            $this->load->view('temp/footer');
        }
        else {
            $image = $_POST['image'];
            $head = $_POST['head'];
            $body = $_POST['body'];
            $footer = $_POST['footer'];

            $config['upload_path'] = './src/img/blog';
            $config['upload_path'] = './uploads/';
            $config['allowed_types'] = 'gif|jpg|png';
            $config['max_size'] = 10000;
            $config['max_width'] = 4000;
            $config['max_height'] = 4000;

            $this->load->library('upload', $config);

            if ( ! $this->upload->do_upload('image'))
            {
                    $error = array('error' => $this->upload->display_errors());
                    $this->load->view('temp/header-short');
                    $this->load->view('admin/create_blog', $error);
                    $this->load->view('temp/footer');
            }
            else
            {
                    $data = array('upload_data' => $this->upload->data());

                    $this->load->view('upload_success', $data);
            }
        }
    } 


Error message is 'You did not upload the file'.

I cannot see anything wrong.