FreeBSD web build failed on build-web.ysv.freebsd.org

[User Www-data]

===> doc/books/handbook (all)
env XML_CATALOG_FILES="file:///usr/local/www/build/head/en_US.ISO8859-1/books/handbook/catalog-cwd.xml  file:///usr/local/www/build/head/en_US.ISO8859-1/share/xml/catalog.xml  file:///usr/local/www/build/head/share/xml/catalog.xml  file:///usr/local/share/xml/catalog" /usr/local/bin/xmllint --nonet --noent --valid --dropdtd --xinclude /usr/local/www/build/head/en_US.ISO8859-1/books/handbook/book.xml > book.parsed.xml.tmp
/usr/local/www/build/head/en_US.ISO8859-1/books/handbook/network-servers/chapter.xml:4157: parser error : Opening and ending tag mismatch: para line 4081 and sect4
	</sect4>
	        ^
/usr/local/www/build/head/en_US.ISO8859-1/books/handbook/network-servers/chapter.xml:4333: parser error : Opening and ending tag mismatch: sect4 line 4010 and sect3
      </sect3>
              ^
/usr/local/www/build/head/en_US.ISO8859-1/books/handbook/network-servers/chapter.xml:4453: parser error : Opening and ending tag mismatch: sect3 line 3957 and sect2
    </sect2>
            ^
/usr/local/www/build/head/en_US.ISO8859-1/books/handbook/network-servers/chapter.xml:4454: parser error : Opening and ending tag mismatch: sect2 line 3234 and sect1
  </sect1>
          ^
/usr/local/www/build/head/en_US.ISO8859-1/books/handbook/network-servers/chapter.xml:5788: parser error : Opening and ending tag mismatch: sect1 line 2939 and chapter
</chapter>
          ^
/usr/local/www/build/head/en_US.ISO8859-1/books/handbook/network-servers/chapter.xml:5789: parser error : Premature end of data in tag chapter line 7

^
/usr/local/www/build/head/en_US.ISO8859-1/books/handbook/network-servers/chapter.xml:5789: parser error : chunk is not well balanced

^
/usr/local/www/build/head/en_US.ISO8859-1/books/handbook/book.xml:288: parser error : Failure to process entity chap.network-servers
    &chap.network-servers;
                          ^
/usr/local/www/build/head/en_US.ISO8859-1/books/handbook/book.xml:288: parser error : Entity 'chap.network-servers' not defined
    &chap.network-servers;
                          ^
*** Error code 1

Stop.
make[4]: stopped in /usr/local/www/build/head/en_US.ISO8859-1/books/handbook
*** Error code 1

Stop.
make[3]: stopped in /usr/local/www/build/head/en_US.ISO8859-1/books
*** Error code 1

Stop.
make[2]: stopped in /usr/local/www/build/head/en_US.ISO8859-1
*** Error code 1

Stop.
make[1]: stopped in /usr/local/www/build/head/en_US.ISO8859-1/htdocs/doc
*** Error code 1

Stop.
make: stopped in /usr/local/www/build/head/en_US.ISO8859-1/htdocs
        5.48 real         2.28 user         3.51 sys