Kevin,
   Thanks for responding. Unfortunately, I checked and there was already a 
space in the DOCTYPE where you highlighted it. I messed around with it, 
even adding an extra blank line and nothing has changed. Same error.  Here 
is what the top of my EAD file currently looks like:

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<?xml-stylesheet type="text/xsl" href="eadcbs5.xsl"?>
<!DOCTYPE ead PUBLIC "+//ISBN 1-931666-00-8//DTD ead.dtd (Encoded Archival 
Description (EAD) Version 2002)//EN" "ead.dtd">

<ead relatedencoding="MARC21"> 
  <eadheader langencoding="iso639-2b" audience="internal"
	scriptencoding="iso15924" relatedencoding="MARC21" 
repositoryencoding="iso15511"
	countryencoding="iso3166-1" dateencoding="iso8601" id="a0"> 

Maybe I have missed something?

~Anna