getting update lists failed

[solomon king]

my fedora 9 could not update

this is the message:

failed to get updates

"A security policy in place prevents this sender from sending this
message to this recipient, see message bus configuration file (rejected
message had interface "org.freedesktop.PackageKit.Transaction" member
"GetUpdates" error name "(unset)" destination
"org.freedesktop.PackageKit")"


and 

i found my update software source was empty


can you help me? thank you!