awn-manager crashed with ImportError in <module>()

Binary package hint: avant-window-navigator

release :
Description: Ubuntu 8.04
Release: 8.04

version:
avant-window-navigator:
  Geïnstalleerd: 0.2.1-0ubuntu2
  Kandidaat: 0.2.1-0ubuntu2
  Versietabel:
 *** 0.2.1-0ubuntu2 0
        500 http://archive.ubuntu.com hardy/universe Packages
        100 /var/lib/dpkg/status
     0.2.1-0ubuntu1~gutsy1 0
        500 http://be.archive.ubuntu.com gutsy-backports/universe Packages

-when opening awn-manager :

phire@Cassandra:~$ awn-manager
Traceback (most recent call last):
  File "/usr/bin/awn-manager", line 41, in <module>
    import gnomedesktop
  File "/var/lib/python-support/python2.5/gtk-2.0/gnomedesktop/__init__.py", line 1, in <module>
    from _gnomedesktop import *
ImportError: /usr/lib/libasound.so.2: undefined symbol: midiparser_input_buf
phire@Cassandra:~$

ProblemType: Crash
Architecture: i386
Date: Sat Apr 26 19:31:10 2008
DistroRelease: Ubuntu 8.04
ExecutablePath: /usr/bin/awn-manager
InterpreterPath: /usr/bin/python2.5
NonfreeKernelModules: nvidia
Package: awn-manager 0.2.1-0ubuntu2
PackageArchitecture: all
ProcCmdline: python /usr/bin/awn-manager
ProcEnviron:
 SHELL=/bin/bash
 PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
 LANG=nl_BE.UTF-8
PythonArgs: ['/usr/bin/awn-manager']
SourcePackage: avant-window-navigator
Title: awn-manager crashed with ImportError in <module>()
Uname: Linux 2.6.24-16-generic i686
UserGroups: adm admin audio cdrom dialout dip floppy lpadmin mythtv netdev plugdev powerdev sambashare scanner video