w3c validation error with utf-8

Posted by ian on Stack Overflow See other posts from Stack Overflow or by ian
Published on 2010-06-14T01:17:14Z Indexed on 2010/06/14 1:22 UTC
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Filed under:

php

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validation

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utf-8

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w3c

When I try to validate a certain page I get the below error:

Sorry, I am unable to validate this document because on line 136 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 "\xFF" does not map to Unicode

What exactly does this mean and how can I find out what character is causing the problem?

The page is generated dynamically in PHP and a bit large and I am not sure what to look for.

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