from today I have get a error message while shutdown my laptop. Anybody has idea to solve it? Here is the code:

* Starting periodic command scheduler crond [OK]
* Checking batterystate... [OK]
* Running local boot scripts (/etc/rc.local) [OK]
NetwokManager: <WARN> nm_signal_handler(): Caught signal 15, shutting down normally.
NetwokManager: <info> Caught terminiation signal
NetwokManager: <debug>[1210091816.740501] nm_print_open_socks(): Open Sockets List:
NetwokManager: <debug>[1210091816.740687] nm_print_open_socks(): Open Sockets List:
NetwokManager: <info> Deactivating device eth0.
NetwokManager: <WARN> nm_hal_deinit(): libhal shutdown failed - Connection is closed
NetwokManager: <WARN> nm_dbus_init(): nm_dbus_init() could not get the system bus. Make sure the message bus deamon is running!
NetworkManager: nm_dbus_signal_device_status_change: assertion 'cb-data->data->dbus_connection' failed