Use Language on Error Handling - show_error()

Thanks for this reply but it's not working. I got this error when I try to use this.

Form Security.php

public function csrf_show_error()
{
show_error(lang('message_error_403'), 403);
}

Type: Error

Message: Call to undefined function lang()

Filename: /var/www/gml-app/gml_system/core/Security.php

Line Number: 298

Backtrace:

File: /var/www/gml-app/index.php
Line: 310
Function: require_once

---

If I try have got a new error

public function csrf_show_error()
{
$this->lang->load('gml_general', 'french');
show_error(lang('message_error_403'), 403);
}

A PHP Error was encountered
Severity: Notice

Message: Undefined property: CI_Security::$lang

Filename: core/Security.php

Line Number: 298

Backtrace:

File: /var/www/gml-app/index.php
Line: 310
Function: require_once

An uncaught Exception was encountered
Type: Error

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

Filename: /var/www/gml-app/gml_system/core/Security.php

Line Number: 298

Backtrace:

File: /var/www/gml-app/index.php
Line: 310
Function: require_once