setup signature not found on diskless client

hi all
i have made a diskless client using dhcp server on red hat linux 8.
the dhcp conf file looks like
server-identifier server.netmag.de;
option subnet-mask 255.255.255.0;
option routers 192.168.1.0;
option domain-name-servers 192.168.1.1;
option domain-name "netmag.de";

use-host-decl-names on;

shared-network WORKSTATIONS {
subnet 192.168.1.0 netmask 255.255.255.0 {
}
}
group {
use-host-decl-names on;

host pc1 {
hardware ethernet 00:80:C89:31:C1;
# ---MAC address
fixed-address 192.168.1.10;
# ---assigned IP number
filename "pc1/bootImage"
}
host pc2 {
hardware ethernet 00:E3:7F:86:3F:B9;
fixed-address 192.168.0.119;
filename "pc2/bootImage";
}
}


when i boot the diskless client, it gives an eroor, "setup signature
not found".
please give me some help regarding this.

thanx
himanshu