A PHP Error was encountered

Severity: Notice

Message: Undefined index: lang

Filename: pages/lang.php

Line Number: 4

Backtrace:

File: /var/www/html/avs/applications/views/pages/lang.php
Line: 4
Function: _error_handler

File: /var/www/html/avs/applications/controllers/Lang.php
Line: 10
Function: view

File: /var/www/html/avs/index.php
Line: 315
Function: require_once

A PHP Error was encountered

Severity: Notice

Message: Undefined index: lang

Filename: pages/lang.php

Line Number: 7

Backtrace:

File: /var/www/html/avs/applications/views/pages/lang.php
Line: 7
Function: _error_handler

File: /var/www/html/avs/applications/controllers/Lang.php
Line: 10
Function: view

File: /var/www/html/avs/index.php
Line: 315
Function: require_once

something