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some problem about openstack compute nova

Hi,I installed Openstack Folsom on my PC with Ubuntu 12.04.But I always met some problems when I use the service nova. For example,here is the nova list output :

root@ubuntu:/etc/init.d# nova list ERROR:dbus.proxies:Introspect error on :1.22:/org/freedesktop/secrets/aliases/default: dbus.exceptions.DBusException: org.freedesktop.Secret.Error.NoSuchObject: The '/org/freedesktop/secrets/aliases/default' object does not exist ERROR:dbus.connection:Unable to set arguments ({'org.freedesktop.Secret.Item.Label': ' @ novaclient_auth', 'org.freedesktop.Secret.Item.Attributes': {'username': '', 'service': 'novaclient_auth'}}, dbus.Struct((dbus.ObjectPath('/org/freedesktop/secrets/session/s10'), '', dbus.ByteArray('fc8cfbdcc08344b0960109d5eb10b771|'), 'text/plain'), signature=None), True) according to signature None: <type 'exceptions.typeerror'="">: Expected a string or unicode object How can I deal with it ?Thanks.