Messages in log

[eluser]jasonfx[/eluser]
Hi all,

I'm having trouble figuring out why these error keep clogging the log file. Hoping someone here can help:

Code:

ERROR - 2011-10-24 23:44:20 --&gt; Severity: Notice  --&gt; iconv() [<a href='function.iconv'>function.iconv</a>]: Detected an illegal character in input string /home/site/public_html/system/core/Utf8.php 89

and

Code:

ERROR - 2011-10-24 23:38:48 --> 404 Page Not Found --> images