MobileRead Forums - Error XML not well formed

Hi there,
I am rather new to the ebook world. Apologies is a similar thread already exists. I am seeing this error after converting a word doc to xhtml with notepad++

"Error XML not well formed: attribute name near column 11"

I've tried deleting bits and nothing I do seems to fix it..it doesn't look wrong to me...any suggestions? Thanks!

Code:

<?xml version="1.0" encoding="utf-8" ?>

<package unique-identifier="BookId" version="2.0" xmlns="http://www.idpf.org/2007/opf">

  <metadata xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:opf="http://www.idpf.org/2007/opf">

    <dc:identifier id="BookId" opf:scheme="UUID">urn:uuid:2bc70065-7d5d-481c-9e1d-338b5ed4dba6</dc:identifier>

    <dc:language opf:scheme="DCTERMS.RFC4646">en-US</dc:language>

    <dc:source>http://xml.openoffice.org/odf2xhtml</dc:source>

    <dc:creator>Briana Ellis</dc:creator>

    <dc:dc:date opf:event="publication" opf:scheme="DCTERMS.W3CDTF">2017-05-25T11:24:00</dc:dc:date>

    <dc:contributor>Briana Ellis</dc:contributor>

    <dc:dc:date opf:event="modification" opf:scheme="DCTERMS.W3CDTF">2017-05-25T11:24:00</dc:dc:date>

    <dc:subject>,</dc:subject>

  </metadata>

  <manifest>

    <item href="toc.ncx" id="ncx" media-type="application/x-dtbncx+xml"/>

    <item href="Text/Carmilla%20V3.xhtml" id="Carmilla_V3.xhtml" media-type="application/xhtml+xml"/>

  </manifest>

  <spine toc="ncx">

    <itemref idref="Carmilla_V3.xhtml"/>

  </spine>

  <guide>

  </guide>

</package>