Help deciphering error

am working my way towards understanding ePub well enough to make a work
that will ideally work on ePub readers and be intelligible to KindleGen.

Error(core):E1005: Could not access file.
      in file: /tmp/mobi-aV9iG9/OEBPS/title_page.xhtml
I am not sure what to make of it; the source directory has an
OEBPS/title_page.xhtml:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
   "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html>
    <head>
        <title>Unvera Announces New Kool-Aid Line</title>
        <style type="text/css">
            body
                {
                text-align: center;
                }
        </style>
    </head>
    <body>
        <h1>Unvera Announces New Kool-Aid Line</h1>
        <h2>by<br />C.J.S. Hayward</h2>
        <p>C.J.S. Hayward Publications, Wheaton</p>
    </body>
</html>
My content.opf reads:

<?xml version="1.0" encoding="UTF-8">
<package xmlns="http://www.idpf.org/2007/opf" unique-identifier="BookID"
  version="3.0">
    <metadata xmlns:dc="http://purl.org/dc/elements/1.1/"
      xmlns:opf="http://www.idpf.org/2007/opf">
        <dc:title>@@TITLE@@</dc:title>
        <dc:creator opf:role="aut">C.J.S. Hayward</dc:creator>
        <dc:language>en-US</dc:language>
        <dc:rights>© 1993-2017 by C.J.S. Hayward. Distribute
freely.</dc:rights>
        <dc:publisher>C.J.S. Hayward Publications,
CJSHayward.com</dc:publisher>
        <dc:identifier id="BookID"
           opf:scheme="UUID">CJSHayward@@IDENTIFIER@@</dc:identifier>
        <meta name="cover" content="cover-image" />
    </metadata>
    <manifest>
        <item id="cover-image" href="cover.jpg" media-type="image/jpeg" />
        <item id="ncx" href="toc.xhtml"
media-type="application/x-dtbncx+xml" />
        <item id="style" href="stylesheet.css" media-type="text/css" />
        <item id="pagetemplate" href="page-template.xpgt"
          media-type="application/vnd.adobe-page-template+xml" />
        <item id="titlepage" href="title_page.xhtml"
          media-type="application/xhtml+xml" />
        @@CHAPTERS@@
    </manifest>
    <spine toc="ncx">
        @@CONTENTS@@
    </spine>
    <guide>
        <reference href="cover.html" type="cover" title="Cover" />
    </guide>
</package>
Is there anything that appears wrong in that file? In particular, are my
paths under the <manifest> done right or wrong?

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
   "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html>
    <head>
        <title>Unvera Announces New Kool-Aid Line</title>
        <style type="text/css">
            body
                {
                text-align: center;
                }
        </style>
    </head>
    <body>
        <h1>Unvera Announces New Kool-Aid Line</h1>
        <h2>by<br />C.J.S. Hayward</h2>
        <p>C.J.S. Hayward Publications, Wheaton</p>
    </body>
</html>


-- 
Christos Jonathan Seth Hayward,
An Orthodox Christian author.
Amazon <http://amazon.com/author/cjshayward> - email
<christos.jonathan.hayward@gmail.com> - website <https://cjshayward.com>.
Would you help me get to Mount Athos?
<https://gofundme.com/the-holy-mountain>

Received on Thursday, 2 November 2017 14:43:26 UTC