New installed FC4. Error when running "apt-get update"

How could I resolve this problem? Thanks.

[root@localhost ~]# apt-get update
Get:1 http://ayo.freshrpms.net fedora/linux/4/i386 release [1834B]
Get:2 http://rpm.livna.org fedora/4/i386 release [801B]
Fetched 2635B in 0s (2904B/s)
Hit http://rpm.livna.org fedora/4/i386/lvn pkglist
Hit http://rpm.livna.org fedora/4/i386/lvn release
Hit http://rpm.livna.org fedora/4/i386/lvn srclist
Hit http://ayo.freshrpms.net fedora/linux/4/i386/core pkglist
Hit http://ayo.freshrpms.net fedora/linux/4/i386/core release
Hit http://ayo.freshrpms.net fedora/linux/4/i386/extras pkglist
Hit http://ayo.freshrpms.net fedora/linux/4/i386/extras release
Hit http://ayo.freshrpms.net fedora/linux/4/i386/updates pkglist
Hit http://ayo.freshrpms.net fedora/linux/4/i386/updates release
Hit http://ayo.freshrpms.net fedora/linux/4/i386/freshrpms pkglist
Hit http://ayo.freshrpms.net fedora/linux/4/i386/freshrpms release

rpmdb: Program version 4.2 doesn't match environment version
error: db4 error(22) from dbenv->open: Invalid argument
error: cannot open Packages index using db3 - Invalid argument (22)
error: cannot open Packages database in /var/lib/rpm
E: could not open RPM database

updatedb

试试看行不行