Gstreamer error when adding Instrument in Jokosher

[Stormdragon]

Binary package hint: jokosher

I clicked on the add instrument button and tried to add some instruments. This happens every time. The exact error is:
Argh! Something went wrong and a serious error occurred:

GStreamer encountered a general stream error.

gstbasesrc.c(2165): gst_base_src_loop (): /timeline/playbackbin/Instrument_1/gnlcomposition1/gnlsource1/audiotestsrc2:
streaming task paused, reason not-linked (-1)

It is recommended that you report this to the Jokosher developers or get help at http://www.jokosher.org/forums/

ProblemType: Bug
Architecture: i386
Date: Fri Sep 26 20:04:55 2008
DistroRelease: Ubuntu 8.04
Package: jokosher 0.9-0ubuntu1
PackageArchitecture: all
ProcEnviron:
 PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: jokosher
Uname: Linux 2.6.24-19-generic i686