Sometimes when uploading files i get the following my error log filled with these errors:

[17-Apr-2013 13:37:34] PHP Notice:  iconv() [<a href='function.iconv'>function.iconv</a>]: Detected an illegal character in input string in include_phpuploader.php on line 70

line 70 is:

$ar[$k] = iconv("UCS-2",$PhpUploader_InternalEncoding,pack("H4",substr($v,-4)));

I got no clue what it means, It happens to me with a certain file all the time and no matter what i rename it too it still keeps on doing this error, the file cannot get uploaded...

Any hints?