I also get this error. If I manually select "PulseAudio" in the preferences menu, the problem goes away for one playback. If I stop and then click Play again, I get the Gstreamer error and have to go back to the preferences menu to fix it.
I also get this error. If I manually select "PulseAudio" in the preferences menu, the problem goes away for one playback. If I stop and then click Play again, I get the Gstreamer error and have to go back to the preferences menu to fix it.