User Permissions with CodeIgniter

I'm redesigning a system in CodeIgniter, I'm new to it, and I'm trying to load a function from my Controller that will check whether or not the user has access to such a resource / screen / etc.

I'm using a TEXT field in the database with all the permissions for each user level that I then bring them inside a session variable with the login procedure and I try to check the permission.

On my Controller Users.php :

public function UserHasPermissions($permission){
    checkSession($this);

    $arrayPermissions = explode($this->sessions->userdata('session_permissions'));
    if(in_array($permission, $arrayPermissions)){
        return true;
    } else {
    return false;
    }
}

In my View% with% I'm doing the following test.

$this->load->view('commons/header');
if($this->Users->UserHasPermissions('ADD_MEETING')){
    echo 'content';
}
$this->load->view('commons/footer');

And I'm getting the following error:

An uncaught Exception was encountered
Type: Error

Message: Call to a member function UserHasPermissions() on null

Filename: /var/www/html/DF_CHECKER_CI/application/views/home.php

Line Number: 4

I have read some articles but could not translate them to my need.

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