$ tryton-client
Traceback (most recent call last):
  File "/usr/bin/tryton-client", line 60, in <module>
    tryton.client.TrytonClient().run()
  File "/usr/lib/python2.7/dist-packages/tryton/client.py", line 83, in __init__
    common.ICONFACTORY.load_client_icons()
  File "/usr/lib/python2.7/dist-packages/tryton/common/common.py", line 68, in load_client_icons
    os.path.join(PIXMAPS_DIR, fname).decode('utf-8'))
glib.GError: Couldn't recognize the image file format for file '/usr/share/icons/tryton/tryton-mail-message.svg'