Thanks for this insight. I did look in some of the files and found this command:
<a id="anthor-94-anchor" class="calibre4"></a>
This command gave me problems once before and just getting rid of it fixed the problem. However it was in almost all my files. I don't know if Calibre generated this or where it came from.
This is another one of the errors from iTunes Connect:
ERROR ITMS-9000: "Invalid URI in manifest OEBPS/Addl FC page.xhtml : Illegal character in path at index 10: OEBPS/Addl FC page.xhtml" at Book (MZItmspBookPackage)
This is the file it is referring to:
<?xml version='1.0' encoding='utf-8'?>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Addl FC page.xhtml</title>
<meta content="http://www.w3.org/1999/xhtml; charset=utf-8" http-equiv="Content-Type"/><link href="../stylesheet.css" type="text/css" rel="stylesheet"/><style type="text/css">
@page { margin-bottom: 5.000000pt; margin-top: 5.000000pt; }</style></head>
<body class="calibre">
<div id="addl-fc-page" class="calibre1">
<div class="calibre1">
<img src="images/Addl%20forgotton%20classic_fmt.jpeg" alt="Addl forgotton classics.jpg" class="calibre2"/>
</div>
</div>
</body>
</html>
I just don't know enough of the language here to know what is invalid. But this same error is occurring in several other files and I would get rid of it if I knew what to look for.
Any help you could offer would be appreciated.