When I follow the link in your error message, I get the page with this thread on it. When I "View Page Source," copy-paste the HTML code for the whole page into a text file and go to line 855, I see:
HTML Code:
<!-- icon and title -->
<div class="smallfont">
<img class="inlineimg" src="images/icons/icon1.gif" alt="Default" border="0" />
<strong>Syntax error</strong>
</div>
<hr size="1" style="color:#CABCAA; background-color:#CABCAA" />
<!-- / icon and title -->
<!-- message -->
<div id="post_message_1255400">
'Done but with errors on page.'<br />
<br />
-- which appears to be the very beginning of this thread, right after your author info ("Wisest Elder Ever", "In a cloud upside down", Premier Poobah badge, etc.)
Of course it's possible that whatever generated the error message didn't number lines exactly the same way as the text editor I viewed the HTML with -- or that the "Line" number in the "Syntax error" message referred not to the HTML but to something else like the PHP source code for that page.
Since I don't really know what I'm doing, there's a distinct possibility that everything I've just said may be irrelevant.
Anyway, FWIF, I don't get that error message myself -- only the copy of it that you posted.