audio_common - sound_play error "playbin" not found

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I try to make text to speech work on the raspberry.

I use groovy and after copying the "sound_play" folder from the "audio_common" package from github and using catkin_make, it basically works. But when sending the command "rosrun sound_play say.py 'text' " I get the following error from soundplay_node.py:

[INFO] [WallTime: 1393587210.981293] sound_play node is ready to play sound
[ERROR] [WallTime: 1393587241.765914] Exception in callback: playbin
[INFO] [WallTime: 1393587241.789185] Traceback (most recent call last):
  File "/home/pi/ros/src/sound_play/scripts/soundplay_node.py", line 217, in callback
    self.voicesounds[data.arg] = soundtype(wavfilename)
  File "/home/pi/ros/src/sound_play/scripts/soundplay_node.py", line 80, in __init__
    self.sound = gst.element_factory_make("playbin","player")
ElementNotFoundError: playbin

Can anyone help me in solving this problem?

Background Info: Same problem is reported here: https://code.ros.org/trac/ros-pkg/tic... Seems that the programmers from PR2 also had the same error but did not poste how to solve it: https://github.com/ros-drivers/audio_... Note: I use the "hydro" version of sound_play, as groovy version is not working due to a bug (see https://github.com/ros-drivers/audio_... ).