deluge error

nixbox deluge-torrent-0.5.7.1 # deluge
no existing Deluge session
Starting new Deluge session...
deluge_core; using libtorrent 0.13.0.0. Compiled with NDEBUG.
Applying preferences
Pickling state...
Scanning plugin dir /usr/share/deluge/plugins
Initialising plugin TorrentCreator
Initialising plugin MoveTorrent
Initialising plugin TorrentSearch
Initialising plugin BlocklistImport
Initialising plugin TorrentFiles
Initialising plugin WebSeed
Initialising plugin TorrentPeers
Initialising plugin TorrentNotification
Initialising plugin DesiredRatio
Initialising plugin NetworkHealth
Initialising plugin Locations
Initialising plugin SpeedLimiter
Initialising plugin ExtraStats
Initialising plugin NetworkGraph
Initialising plugin EventLogging
Initialising plugin WebUi
Initialising plugin Scheduler
Initialising plugin FlexRSS
Traceback (most recent call last):
  File "/usr/bin/deluge", line 136, in ?
    start_deluge()
  File "/usr/bin/deluge", line 117, in start_deluge
    interface = deluge.interface.DelugeGTK()
  File "/usr/lib/python2.4/site-packages/deluge/interface.py", line 75, in __init__
    self.window.set_icon(common.get_logo(32))
  File "/usr/lib/python2.4/site-packages/deluge/common.py", line 154, in get_logo
    size, size)
gobject.GError: Unrecognized image file format