I finally finished this lab today. I tried to use 3 fs files, the privious 2 could not work. The following is my steps.
Firstly, I installed the livecd tool.
#yum install livecd-tools
Secondly, I entered the /usr/share/livecd-tools directory, picked a fs file and edited it to modify the Selinux to disabled.
Thirdly, I run the command “livecd-creator -c livecd-fedora-minimal.ks”, it failed. Then I tried to use the “livecd-fedora-9-kde.ks” file, it also failed. Finally, I used the file “livecd-fedora-9-base-desktop.ks”, it successed.
Finally, I used the Virtual Machine Manager to verify, it OK.