can not run network manager (nm-applet)

I just installed opensuse 11.2 64bit but unfortunately I don’t have network manager icon in my system tray I’ve tried nm-applet command in konsole but it gives me some error like following :

applet_dbus_manager_start_service(): Could not acquire the NetworkManagerUserSettings service as it is already taken.

could you please let me know what shall I do for this problem?