A PHP Error was encountered

Severity: Notice

Message: Undefined index: lang

Filename: controllers/cards.php

Line Number: 98

Backtrace:

File: D:\EasyPHP-Devserver-17\eds-www\webfaa\unicorn\controllers\cards.php
Line: 98
Function: _error_handler

File: D:\EasyPHP-Devserver-17\eds-www\webfaa\index.php
Line: 315
Function: require_once