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

[User Www-data]

	                                           ^
/home/www/build/relnotes9/doc/en_US.ISO8859-1/relnotes/article.xml:1248: element para: validity error : No declaration for element para
	  configuration files.</para>
	                             ^
/home/www/build/relnotes9/doc/en_US.ISO8859-1/relnotes/article.xml:1249: element important: validity error : No declaration for element important
      </important>
                  ^
/home/www/build/relnotes9/doc/en_US.ISO8859-1/relnotes/article.xml:1250: element sect2: validity error : No declaration for element sect2
    </sect2>
            ^
/home/www/build/relnotes9/doc/en_US.ISO8859-1/relnotes/article.xml:1253: element title: validity error : No declaration for attribute id of element title
      <title id="upgrade-pitfalls">User-visible incompatibilities</title>
                                  ^
/home/www/build/relnotes9/doc/en_US.ISO8859-1/relnotes/article.xml:1253: element title: validity error : No declaration for element title
      <title id="upgrade-pitfalls">User-visible incompatibilities</title>
                                                                         ^
/home/www/build/relnotes9/doc/en_US.ISO8859-1/relnotes/article.xml:1259: element ulink: validity error : No declaration for attribute url of element ulink
	url="http://www.freebsd.org/releases/9.0R/relnotes-detailed.html#UPGRADE">Upgra
	                                                                         ^
/home/www/build/relnotes9/doc/en_US.ISO8859-1/relnotes/article.xml:1260: element ulink: validity error : No declaration for element ulink
	Section in 9.0-RELEASE Release Notes</ulink> carefully before
	                                            ^
/home/www/build/relnotes9/doc/en_US.ISO8859-1/relnotes/article.xml:1262: element emphasis: validity error : No declaration for element emphasis
	FreeBSD mailing lists.</emphasis></para>
	                                 ^
/home/www/build/relnotes9/doc/en_US.ISO8859-1/relnotes/article.xml:1262: element para: validity error : No declaration for element para
	FreeBSD mailing lists.</emphasis></para>
	                                        ^
/home/www/build/relnotes9/doc/en_US.ISO8859-1/relnotes/article.xml:1263: element sect2: validity error : No declaration for element sect2
    </sect2>
            ^
/home/www/build/relnotes9/doc/en_US.ISO8859-1/relnotes/article.xml:1264: element sect1: validity error : No declaration for element sect1
  </sect1>
          ^
/home/www/build/relnotes9/doc/en_US.ISO8859-1/relnotes/article.xml:1265: element article: validity error : No declaration for element article
</article>
          ^
*** [article.parsed.xml] Error code 4

Stop in /home/www/build/relnotes9/doc/en_US.ISO8859-1/relnotes.
*** [all] Error code 1

Stop in /home/www/build/relnotes9/doc/en_US.ISO8859-1.
*** [all] Error code 1

Stop in /home/www/build/head/en_US.ISO8859-1/htdocs/relnotes.
*** [all] Error code 1

Stop in /home/www/build/head/en_US.ISO8859-1/htdocs.
      484.15 real       444.01 user        40.77 sys