Setting and Getting Session and Flashdata

full simple example for CI4:

PHP Code:

<?php
namespace App\Models;

use \Config\Services\session;

class My_Model
{
     private session = null;
     
     public function __construct() {
           $this->session = new session();
     }
     public function setDataSession($data) {
           // ... you code
           $this->session->set( $data );
           // ... you another code
     }
} 


It throws error