[CentOS-mirror] YUM UPDATE

[root at data ~]# yum update
Loaded plugins: fastestmirror, security
Loading mirror speeds from cached hostfile
YumRepo Error: All mirror URLs are not using ftp, http[s] or file.
 Eg. Invalid release/
removing mirrorlist with no valid mirrors:
/var/cache/yum/base/mirrorlist.txt
Error: Cannot find a valid baseurl for repo: base
[root at data ~]#


pls solved
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