A PHP Error was encountered

Severity: Notice

Message: iconv(): Detected an illegal character in input string

Filename: controllers/Bbs.php

Line Number: 72

Backtrace:

File: /home/edu/app/controllers/Bbs.php
Line: 72
Function: iconv

File: /home/edu/app/controllers/Bbs.php
Line: 38
Function: download

File: /home/edu/index.php
Line: 304
Function: require_once