[uwog@sigma sugar-jhbuild]$ ./sugar-jhbuild run
Running the installed sugar...
_XSERVTransSocketUNIXCreateListener: ...SocketCreateListener() failed
_XSERVTransMakeAllCOTSServerListeners: server already running

Fatal server error:
Cannot establish any listening sockets - Make sure an X server isn't already running
matchbox: can't open display! check your DISPLAY variable.
/VirtualMachines/sugar-jhbuild/build/lib/python2.4/site-packages/gtk-2.0/gtk/__init__.py:69: GtkWarning: could not open display
  warnings.warn(str(e), _gtk.Warning)
/VirtualMachines/sugar-jhbuild/build/lib/python2.4/site-packages/sugar/graphics/style.py:22: GtkWarning: gdk_screen_get_width: assertion `GDK_IS_SCREEN (screen)' failed
  _screen_factor = gtk.gdk.screen_width() / 1200.0
/VirtualMachines/sugar-jhbuild/build/lib/python2.4/site-packages/sugar/graphics/canvasicon.py:31: GtkWarning: gtk_icon_theme_get_for_screen: assertion `GDK_IS_SCREEN (screen)' failed
  self._theme = gtk.icon_theme_get_default()
/VirtualMachines/sugar-jhbuild/build/lib/python2.4/site-packages/sugar/graphics/grid.py:25: GtkWarning: gdk_screen_get_width: assertion `GDK_IS_SCREEN (screen)' failed
  self._factor = gtk.gdk.screen_width() / COLS
Traceback (most recent call last):
  File "/VirtualMachines/sugar-jhbuild/build/bin/sugar-shell", line 38, in ?
    from view.Shell import Shell
  File "/VirtualMachines/sugar-jhbuild/build/share/sugar/shell/view/Shell.py", line 23, in ?
    from view.home.HomeWindow import HomeWindow
  File "/VirtualMachines/sugar-jhbuild/build/share/sugar/shell/view/home/HomeWindow.py", line 23, in ?
    from view.home.MeshBox import MeshBox
  File "/VirtualMachines/sugar-jhbuild/build/share/sugar/shell/view/home/MeshBox.py", line 26, in ?
    import conf
  File "/VirtualMachines/sugar-jhbuild/build/share/sugar/shell/conf/__init__.py", line 1, in ?
    from conf.ActivityRegistry import _ActivityRegistry
  File "/VirtualMachines/sugar-jhbuild/build/share/sugar/shell/conf/ActivityRegistry.py", line 22, in ?
    from sugar import activity
  File "/VirtualMachines/sugar-jhbuild/build/lib/python2.4/site-packages/sugar/activity/__init__.py", line 9, in ?
    settings.set_string_property('gtk-icon-sizes', sizes, '')
AttributeError: 'NoneType' object has no attribute 'set_string_property'