Update:
this is output of app when i played song in banshee after covergloobus runned by this command.

yaseen@yaseen-Ubuntu:~$ covergloobus --debug
[DEBUG] Installed themes:
   *  /usr/share/covergloobus/themes/Ibex ,
   *  /usr/share/covergloobus/themes/ToolTip ,
   *  /usr/share/covergloobus/themes/Polaroid ,
   *  /usr/share/covergloobus/themes/BadChoice3 ,
   *  /usr/share/covergloobus/themes/Vinyl ,
   *  /usr/share/covergloobus/themes/corner ,
   *  /usr/share/covergloobus/themes/BoxOfTricksMod ,
   *  /usr/share/covergloobus/themes/BoxOfTricks ,
   *  /usr/share/covergloobus/themes/simple ,
   *  /usr/share/covergloobus/themes/LucidDark ,
   *  /usr/share/covergloobus/themes/Coversutra ,
   *  /usr/share/covergloobus/themes/45Controls ,
   *  /usr/share/covergloobus/themes/iSticky ,
   *  /usr/share/covergloobus/themes/BadChoice ,
   *  /usr/share/covergloobus/themes/Dirty ,
   *  /usr/share/covergloobus/themes/Postcard ,
   *  /usr/share/covergloobus/themes/BadChoice2 ,
   *  /usr/share/covergloobus/themes/Postcard2 ,
[DEBUG] Installed players:
   *  Amarok2
   *  Audacious2
   *  Banshee
   *  Clementine
   *  DeaDBeeF
   *  Exaile
   *  Exaile3
   *  Exaile3MPRIS
   *  gmusicbrowser
   *  Grooveshark
   *  Guayadeque
   *  Listen
   *  MOC
   *  MPD
   *  Pithos
   *  QuodLibet
   *  Rhythmbox
   *  Songbird
   *  Spotify
   *  Totem
   *  VLC
[DEBUG] Prefix: /usr
[DEBUG] ABS_PATH: /usr/share/covergloobus
[DEBUG] Initializing dbus
[DEBUG] LYRICS: init done
[DEBUG] COVERSEARCH: loading engine Location
[DEBUG] COVERSEARCH: loading engine Amazon
[DEBUG] Loading player
[DEBUG] Player loaded: Banshee
[DEBUG] UI: Theme path: /usr/share/covergloobus/themes/ToolTip
[DEBUG] Showing status icon: True
[DEBUG] Init done
ERROR:dbus.connection:Exception in handler for D-Bus signal:
Traceback (most recent call last):
  File "/usr/lib/pymodules/python2.6/dbus/connection.py", line 214, in maybe_handle_message
    self._handler(*args, **kwargs)
  File "/usr/share/covergloobus/players/Banshee.py", line 219, in song_changed_handler
    self.cg.update(TRACK, self.get_track())
  File "/usr/share/covergloobus/players/Banshee.py", line 152, in get_track
    data = self.iface.GetCurrentTrack()
  File "/usr/lib/pymodules/python2.6/dbus/proxies.py", line 140, in __call__
    **keywords)
  File "/usr/lib/pymodules/python2.6/dbus/connection.py", line 620, in call_blocking
    message, timeout)
DBusException: System.ArgumentException: An element with the same key already exists in the dictionary.
[WARNING] BANSHEE: name not found in current track
[WARNING] BANSHEE: album not found in current track
[WARNING] BANSHEE: artist not found in current track
[WARNING] BANSHEE: genre not found in current track
[WARNING] BANSHEE: year not found in current track
[WARNING] BANSHEE: track-number not found in current track
[WARNING] BANSHEE: rating not found in current track
[WARNING] BANSHEE: artwork-id not found in current track
ERROR:dbus.connection:Exception in handler for D-Bus signal:
Traceback (most recent call last):
  File "/usr/lib/pymodules/python2.6/dbus/connection.py", line 214, in maybe_handle_message
    self._handler(*args, **kwargs)
  File "/usr/share/covergloobus/players/Banshee.py", line 219, in song_changed_handler
    self.cg.update(TRACK, self.get_track())
  File "/usr/share/covergloobus/players/Banshee.py", line 170, in get_track
    length = data['length']
KeyError: 'length