yum -y update 하고 업데이트 하던도중

Repository base is listed more than once in the configuration
Setting up Update Process
Setting up repositories
Reading repository metadata in from local files
Resolving Dependencies
--> Populating transaction set with selected packages. Please wait.
---> Package lvm2.i386 0:2.02.27-2.el4_6.1 set to be updated
--> Running transaction check
--> Processing Dependency: device-mapper >= 1.02.21-1 for package: lvm2
--> Finished Dependency Resolution
Error: Missing Dependency: device-mapper >= 1.02.21-1 is needed by package lvm2

업데이트가 대다가 이런메세지 출력후 업데이트가 안대내요

무슨말인지 알수 있을까요?;; (CentOs 4.5버전 사용하고 있습니다.)