shell.log after startx

/usr/lib/python2.7/site-packages/jarabe/main.py:54: PyGIWarning: Gtk was imported without specifying a version first. Use gi.require_version('Gtk', '3.0') before import to ensure that the right version gets loaded.
  from gi.repository import Gtk
/usr/lib/python2.7/site-packages/jarabe/main.py:55: PyGIWarning: Gst was imported without specifying a version first. Use gi.require_version('Gst', '1.0') before import to ensure that the right version gets loaded.
  from gi.repository import Gst
Traceback (most recent call last):
  File "/usr/lib/python2.7/runpy.py", line 162, in _run_module_as_main
    "__main__", fname, loader, pkg_name)
  File "/usr/lib/python2.7/runpy.py", line 72, in _run_code
    exec code in run_globals
  File "/usr/lib/python2.7/site-packages/jarabe/main.py", line 56, in <module>
    from gi.repository import Wnck
  File "/usr/lib/python2.7/site-packages/gi/importer.py", line 114, in load_module
    introspection_module = get_introspection_module(namespace)
  File "/usr/lib/python2.7/site-packages/gi/module.py", line 271, in get_introspection_module
    module = IntrospectionModule(namespace, version)
  File "/usr/lib/python2.7/site-packages/gi/module.py", line 120, in __init__
    repository.require(namespace, version)
gi.RepositoryError: Requiring namespace 'Gtk' version '2.0', but '3.0' is already loaded