ddp build failed

building [html]: targets for 9 source files that are out of date
updating environment: [new config] 9 added, 0 changed, 0 removed
reading sources... [ 11%] about
reading sources... [ 22%] contributors
reading sources... [ 33%] index
reading sources... [ 44%] installing
reading sources... [ 55%] issues
reading sources... [ 66%] moreinfo
reading sources... [ 77%] old-stuff
reading sources... [ 88%] upgrading
reading sources... [100%] whats-new


Warning, treated as error:
/srv/www.debian.org/release-notes/release-notes/source/whats-new.rst:301:<translated>:1:Inline interpreted text or phrase reference start-string without end-string.
make: *** [Makefile:161: build/el/html/index.html] Error 2