Error saat berhasil hosting codeigniter

https://imgur.com/RJAQLJJ

An uncaught Exception was encountered

Type: RuntimeException

Message: Unable to locate the model you have specified: Model

Filename: C:\xampp\htdocs\nilai_rapor\system\core\Loader.php

Line Number: 348

Backtrace:

File: C:\xampp\htdocs\nilai_rapor\index.php

Line: 315

Function: require_once

https://imgur.com/9TOrTCk

https://imgur.com/HtA3eVZ

controller

<?php

class Auth extends CI_Controller{

    public function index()
    {
        $this->load->view('templates_administrator/header');
        $this->load->view('administrator/login');
        $this->load->view('templates_administrator/footer');
    }

    public function proses_login()
    {
        $this->from_validation->set_rules('username','username','required');
        $this->from_validation->set_rules('password','password','required');
        if ($this->from_validation->run() == FALSE) {
            $this->load->view('templates_administrator/header');
            $this->load->view('administrator/login');
            $this->load->view('templates_administrator/footer');
        }else {
            $username = $this->input->post('username');
            $password = $this->input->post('password');

            $user = $username;
            $pass = MD5($password);

            $cek = $this->login_model->cek_login($user, $pass);

            if ($cek->num_rows() > 0){

                foreach ($cek->result() as $ck) {
                    $sess_data['username'] = $ck->username;
                    $sess_data['email'] = $ck->email;
                    $sess_data['level'] = $ck->level;

                    $this->session->set_userdata($sess_data);
                }
                if($sess_data['level'] == 'admin'){
                     redirect('administrator/dashboard');
                }else {
                    $this->session->set_flashdata('pesan',' Username atau Password Anda Salah');
                    redirect('administrator/auth');
                }

            }else{
                $this->session->set_flashdata('pesan',' Username atau Password Anda Salah');
                redirect('administrator/auth');
            }
        }
    }
}