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

[User Www-data]

===> search
===> search/opensearch
===> security
===> security/advisories
===> security/patches
===> snapshots
===> support
===> doc
===> doc/articles (all)
===> doc/articles/bsdl-gpl (all)
===> doc/articles/building-products (all)
===> doc/articles/casestudy-argentina.com (all)
===> doc/articles/committers-guide (all)
===> doc/articles/compiz-fusion (all)
===> doc/articles/console-server (all)
===> doc/articles/contributing (all)
===> doc/articles/contributing-ports (all)
===> doc/articles/contributors (all)
/usr/bin/grep '^<?xml version=.*?>' article.xml > article.parsed.xml.tmp
echo '<!DOCTYPE article PUBLIC "-//FreeBSD//DTD DocBook XML V4.5-Based Extension//EN" "../../../share/xml/freebsd45.dtd">' >> article.parsed.xml.tmp
==> Basic validation
env XML_CATALOG_FILES="file:///home/www/build/head/en_US.ISO8859-1/articles/contributors/catalog-cwd.xml  file:///home/www/build/head/en_US.ISO8859-1/share/xml/catalog.xml  file:///home/www/build/head/share/xml/catalog.xml  file:///home/www/build/head/share/xml/catalog-common.xml  file:///usr/local/share/xml/catalog" /usr/local/bin/xmllint --nonet --noent --valid --xinclude --dropdtd /home/www/build/head/en_US.ISO8859-1/articles/contributors/article.xml |  /usr/bin/grep -v '^<?xml version=.*?>' >> article.parsed.xml.tmp
/home/www/build/head/en_US.ISO8859-1/articles/contributors/contrib.committers.xml:407: parser error : Entity 'a.feld' not defined
      <para>&a.feld;</para>
                    ^
/home/www/build/head/en_US.ISO8859-1/articles/contributors/contrib.committers.xml:1686: parser error : chunk is not well balanced

^
/home/www/build/head/en_US.ISO8859-1/articles/contributors/article.xml:338: parser error : Failure to process entity contrib.committers
    &contrib.committers;
                        ^
/home/www/build/head/en_US.ISO8859-1/articles/contributors/article.xml:338: parser error : Entity 'contrib.committers' not defined
    &contrib.committers;
                        ^
*** [article.parsed.xml] Error code 1

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

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

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

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

Stop in /home/www/build/head/en_US.ISO8859-1/htdocs.
        5.60 real         3.33 user         2.37 sys