dbus.proxies:Introspect error

Hi,

I installed Openstack Folsom using 3 vmware VMs (folsom-controller, folsom-network, and folsom-compute)
When I try to start an instance, I get all the time an ERROR on the Status field,

when I check using nova-manage service liste, the different services are running :-)

However, whatever the nova command I execute, before the result I have this message:

 ERROR:dbus.proxies:Introspect error on :1.1:/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': 'http://localhost:5000/v2.0/admin//publicURL/compute// @ novaclient_auth', 'org.freedesktop.Secret.Item.Attributes': {'username': 'http://localhost:5000/v2.0/admin//publicURL/compute//', 'service': 'novaclient_auth'}}, dbus.Struct((dbus.ObjectPath('/org/freedesktop/secrets/session/s6'), '', dbus.ByteArray('f45dbe43a42e48dbae6cbc6006d467d9|http://localhost:8774/v2/1ce5b023531346faa58779cb906416ed'), 'text/plain'), signature=None), True) according to signature None: <type 'exceptions.TypeError'>: Expected a string or unicode object

for example:
root@controller:/home/architecture# nova secgroup-list

ERROR:dbus.proxies:Introspect error on :1.1:/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': 'http://192.168.200.211:5000/v2.0/admin//publicURL/compute// @ novaclient_auth', 'org.freedesktop.Secret.Item.Attributes': {'username': 'http://192.168.200.211:5000/v2.0/admin//publicURL/compute//', 'service': 'novaclient_auth'}}, dbus.Struct((dbus.ObjectPath('/org/freedesktop/secrets/session/s8'), '', dbus.ByteArray('ece561c3b577401d8006c306e8211a95|http://192.168.200.211:8774/v2/1ce5b023531346faa58779cb906416ed'), 'text/plain'), signature=None), True) according to signature None: <type 'exceptions.TypeError'>: Expected a string or unicode object
+---------+-------------+
| Name | Description |
+---------+-------------+
| default | default |
+---------+-------------+

Someone can help?
Thank's.