D: 817.00: quodlibet.init_backend: Initializing audio backend (gstbe)
Traceback (most recent call last):
  File "/usr/lib64/python2.7/site-packages/quodlibet/player/__init__.py", line 29, in init
    backend = __import__(modulename, {}, {}, "quodlibet.player")
  File "/usr/lib64/python2.7/site-packages/quodlibet/player/gstbe/__init__.py", line 8, in <module>
    from .player import init
  File "/usr/lib64/python2.7/site-packages/quodlibet/player/gstbe/player.py", line 13, in <module>
    raise ImportError(e)
ImportError: Namespace Gst not available

E: Invalid audio backend. The audio backend 'gstbe' is not installed.