kickstart - RedHat Linux

This is my ks.cfg file.

[root@localhost install_server]# cat ks.cfg
#platform=x86, AMD64, or Intel EM64T
#version=DEVEL
# Firewall configuration
firewall --disabled
# Install OS instead of upgrade
install
# Use NFS installation media
nfs --server=10.10.10.8 --dir=/install_server
# Root password
rootpw --iscrypted $1$kvzGOH8N$Of9EldpZJsJP5I/dZA1mB/
# Network information
network --bootproto=dhcp --device=eth0 --onboot=on
# System authorization information
auth --useshadow --passalgo=md5
# Use graphical install
graphical
firstboot --disable
# System keyboard
keyboard us
# System language
lang en_US
# SELinux configuration
selinux --disabled
# Installation logging level
logging --level=info

# System timezone
timezone Africa/Abidjan
# System bootloader configuration
bootloader --location=mbr
# Partition clearing information
clearpart --all
# Disk partitioning information
part /boot --fstype="ext4" --size=200
part / --fstype="ext4" --size=10000
part /home --fstype="ext4" --size=10000
part swap --fstype="swap" --size=1000

%packages
@base
@cifs-file-server
@ftp-server
@mysql
@mysql-client
@nfs-file-server

%end

=======================================================================

[root@localhost install_server]# showmount -e localhost
Export list for localhost:
/install_server *

[root@localhost install_server]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup-LogVol00
6.8G 330M 6.1G 6% /
tmpfs 499M 420K 499M 1% /dev/shm
/dev/sda2 485M 30M 430M 7% /boot
/dev/mapper/VolGroup-LogVol01
4.9G 140M 4.5G 3% /home
/dev/mapper/VolGroup-LogVol05
6.8G 144M 6.3G 3% /opt
/dev/mapper/VolGroup-LogVol02
3.9G 73M 3.6G 2% /tmp
/dev/mapper/VolGroup-LogVol03
6.8G 4.0G 2.5G 62% /usr
/dev/mapper/VolGroup-LogVol04
6.8G 335M 6.1G 6% /var
/dev/mapper/my_vol_grp-my_logical_vol
20G 3.3G 16G 18% /install_server


When I was booting the kickstart client I am typing the command as follows

linux ks=nfs:192.168.0.16:/install_server/ks.cfg

I am getting the following error.