error utf-8?

Hi,

When I try to validate my website (toahulp.freehostia.com), I got this error message: 
Sorry, I am unable to validate this document because on line 375 it contained one or more bytes that I cannot interpret as utf-8 (in other words, the bytes found are not valid values in the specified Character Encoding). Please check both the content of the file and the character encoding indication.. 

The error was: utf8 "\xFD" does not map to Unicode

But all the characters I used on line 375 (and the rest of the webpage), are from the utf-8 list, or at least, according to the utf-8 table at http://www.tony-franks.co.uk/UTF-8.htm.
Is this my fault or is the validator giving a false error?

greets

Tiddo

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