end of document in prolog

From: Melanie Samples <mksamp@gmail.com> Date: Thu, 29 Apr 2010 11:51:20 -0400 Message-ID: <q2m940036401004290851v2ff34389g731a917e2dc2ff75@mail.gmail.com> To: www-validator@w3.org · This archive was generated by hypermail 2.4.0 : Friday, 17 January 2020 22:59:17 UTC

Hello,

I've been checking all of my pages with the validator, and they were all
passing.  After tweaking some CSS, one document did not pass and I got the
following error:

Line 1, Column 1: end of document in prolog
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"

I went back and checked the pages that had previously passed, and they had
the same error.  I went to validate my CSS, and it still validated.  So, I'm
just not sure what is going on.  I searched the archives and saw that there
was a bug with this, but that was back in 2009.  Wondering if the bug is
back?

The website is:

http://courseweb.lis.illinois.edu/~samples2/tutorial/index.html

Thanks!

NOTE: Whenever possible, give the address of the document you were checking.