Invalid format text for lilypond (GNU LilyPond, the music typesetter)

error:
Invalid format text for lilypond (GNU LilyPond, the music typesetter)

how to reproduce error:
dhelp_parse -a /var/lib/doc-base/documents/lilypond

Description: Ubuntu Raring Ringtail (development branch)
Release: 13.04

apt-cache policy lilypond-doc
lilypond-doc:
  Installed: 2.16.0-1~exp+2
  Candidate: 2.16.0-1~exp+2
  Version table:
 *** 2.16.0-1~exp+2 0
        500 http://localhost/ubuntu/ raring/universe amd64 Packages
        500 http://archive.ubuntu.com/ubuntu/ raring/universe amd64 Packages
        100 /var/lib/dpkg/status

corresponding bug reports:
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=689404
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=693238
--- suppossed to be solved by releasing version 2.16.0-1~exp+1 but it is not.