When client got ip that dhcp server distributed,when install os occur this error situation

I press ctrl+alt+F3 , occur this screen messages:

backgroud:

1、dhcpd.conf file like this:
#
# DHCP Server Configuration file.
# see /usr/share/doc/dhcp*/dhcpd.conf.sample
#
ddns-update-style none;
max-lease-time 7200;
default-lease-time 600;
subnet 192.168.134.0 netmask 255.255.255.0 {
range 192.168.134.1 192.168.134.254;
next-server 192.168.134.3;
}
group pxe {
filename "pxelinux.0";
host testserver {
hardware ethernet 00:0c:29:b0:03:20;
}
}

2、default file like this:
[root@opt ~]# vi /tftpboot/pxelinux.cfg/default

default 0
prompt 1
timeout 120
display pxelinux.cfg/boot.msg

label 0
localboot 1
label 1 CentOS5.2_32
kernel centos54_32/vmlinuz
append initrd=centos54_32/initrd.img ramdisk_size=8192 ks=nfs://192.168.134.3/
home/opt/conf/centos54_32.cfg

3、nfs configure file like this:
[root@opt ~]# vi /etc/exports

/home/opt/conf *(ro,sync)
/home/opt/iso/centos54_32 *(ro,sync)

What's the wrong with pxelinux ?

I've had the same issue. Kickstart through NFS never worked for me. In the end, I decided to put the Kickstart file on a web server & that worked perfectly every time.

should this

ks=nfs://192.168.134.3/home/opt/conf/centos54_32.cfg

be this

ks=nfs://192.168.134.3:/home/opt/conf/centos54_32.cfg

But I agree using http for kickstart is a lot easier and less prone to issues.

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i modify according you said ,but the error still stayed.

what's the wrong ?