Error view

ketika memanggil fungsi yang ada pada libraries error mohon bantuan nya

isi model User_m.php

<?php
defined('BASEPATH') or exit('No direct script access allowed');
class User_m extends CI_Model
{

    public function login($post)
    {
        $this->db->select('*');
        $this->db->from('user');
        $this->db->where('username', $post['username']);
        $this->db->where('password', sha1($post['password']));
        $query = $this->db->get();
        return $query;
    }

    public function get($id = null)
    {
        $this->db->select('*');
        $this->db->from('user');
        if ($id != null) {
            $this->db->where('user_id', $id);
        }
        $query = $this->db->get();
        return $query;
    }
}

tampilan libraries Fungsi.php

protected $ci;

    function ___construct()
    {
        $this->ci =& get_instance();
    }

    function user_login()
    {
        $this->ci->load->model('user_m');
        $user_id = $this->ci->session->userdata('userid');
        $user_data = $this->ci->user_m->get($user_id)->row;
        return $user_data;
    }

saat memanggil di view

<span class="hidden-xs"><?=$this->fungsi->user_login()->username?></span>