dbus error

[Barbara]

I'm receiving this error in ~/.xsession-errors:

dbus-daemon: [system] Rejected send message, 2 matched rules; type="
method_call", sender=":1.40" (uid=1001 pid=1691 comm="nautilus) interface="org.
freedesktop.DBus.Properties" member="GetAll" error name="(unset)" 
requested_reply=0 destination=":1.3" (uid=0 pid=1512 comm="
/usr/local/sbin/console-kit-daemon))

What is causing it?

Thanks
Barbara