Unable to locate the model you have specified: my_model

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CodeIgniter

my site have one error

Unable to locate the model you have specified: my_model

model :

<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
 
  class My_Model extends CI_Model{
  		
  	public function __construct(){
  		parent::__construct();
		$this->load->database();
  	}
	/*
	 * insert in DATABASE*
	 */
	public function insert_entry($query){
		$this->db->insert('info',$query);
	}

controller:

$dt=array('upload_data' => $this->upload->data());
			$data=$this->upload->data();
			$inf =array(
			'file_name' =>$data['file_name'],
			);
			$this->load->model('my_model');
			$this->my_model->insert_entry($inf);
			$this->load->view('upload_success', $dt);

db :

$db['default']['hostname'] = '*********';
$db['default']['username'] = '*********';
$db['default']['password'] = '********';
$db['default']['database'] = '**************';
$db['default']['dbdriver'] = 'mysql';
$db['default']['dbprefix'] = '';
$db['default']['pconnect'] = TRUE;
$db['default']['db_debug'] = TRUE;
$db['default']['cache_on'] = FALSE;
$db['default']['cachedir'] = '';
$db['default']['char_set'] = 'utf8';
$db['default']['dbcollat'] = 'utf8_general_ci';
$db['default']['swap_pre'] = '';
$db['default']['autoinit'] = TRUE;
$db['default']['stricton'] = FALSE;