一键安装出现错误，求助！

newbie

Red Hat Enterprise Linux Server release 5.5 (Tikanga)
Kernel \r on an \m
以上是版本，安装失败，还请给看看原因，谢谢！！！

licess

Loaded plugins: rhnplugin, security
This system is not registered with RHN.
RHN support will be disabled.
file:///mnt/cdrom/Server/repodata/repomd.xml: [Errno 5] OSError: [Errno 2] 没有那个文件或目录: '/mnt/cdrom/Server/repodata/repomd.xml'
Trying other mirror.

RHEL安装必须按要求设置安装好yum并启用网络源
https://bbs.vpser.net/thread-7553-1-1.html