impossible to run olive-gtk

I'm not able to run olive : the shortcut created after installation (I followed the instructions on bzr/olive website) doesn't work and when I type olive-gtk in the command windows, I get the following message :

Traceback (most recent call last):
  File "/usr/bin/olive-gtk", line 90, in ?
    app = OliveGtk()
  File "/usr/lib/python2.4/site-packages/olive/__init__.py", line 158, in __init__
    x = self.pref.get_preference('window_x', 'int')
  File "/usr/lib/python2.4/site-packages/olive/__init__.py", line 935, in get_preference
    return self.config.getint('preferences', option)
  File "/usr/lib/python2.4/ConfigParser.py", line 321, in getint
    return self._get(section, int, option)
  File "/usr/lib/python2.4/ConfigParser.py", line 318, in _get
    return conv(self.get(section, option))
ValueError: invalid literal for int(): no

I'm a inexperienced linux user ...

Help would be appreciated,

Thanks,

Quentin