[dokuwiki] Compilation failed: invalid UTF-8 string at offset in inc/html

Hello,

For the first time and in one wiki page only, I get this error:
===
Warning: preg_replace_callback() [function.preg-replace-callback]:
Compilation failed: invalid UTF-8 string at offset 11 in
/home/cochard/public_html/articles/inc/html.php on line 269
===
You can see it there:
http://www.cactuspro.com/articles/l_eclairage_artificiel
I checked several other wiki pages, they display fine.

Where does this error come from?
How can I correct?

Thanks!
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