PXE OS Error Message Is Not PXE Operating System

when I was creating the Pxeos I got the following error message.
Pxeos Error message
While creating pxeos

You must enter directory of the Operating System Software

This directory must include the images/pxeboot directories

Error Mounting: mount: no such partition found

while pxeboot

linux(imagename) is not PXE Operating System

when we want to install the client Operating system from the server using kickstart method,we need to create the pxeboot, while creating it is not created perfeclty.I got the following error message.

ERROR MESSAGE

pxeos -a -i "$OS_IDENTIFIER" -p NFS -D O-s $IPADDR -L /export/$IMAGE_NAME $IMAGE_NAME
You must enter directory of the Operating System Software
This directory must include the images/pxeboot directories
Error Mounting: mount: no such partition found
pxeboot -a -O "$IMAGE_NAME" -K nfs:$IPADDR:/export/$IMAGE_NAME/kshclhpc2.cfg -r 10000 $PXE_NTWK
linux is not PXE Operating System
Check the NFS service whether It is booting perfeclty or not.

PROBLEM

1)check the image contain the image/pxeboot directory with following 4 files
a)initrd.img b)README c)TRANS.TBL d)vmlinuz
2)Or check the NFS Service status

SOLUTION:

1)if you face the first problem copy the DVD content files correctly
2)For second one,
try to restart the nfs service.
a)try to Restart NFS Service, if you face any problem in NFS Service
try the following link NFS ERROR MESSAGE (or) check the the server IP/subnetmask configuration.
b)If NFS is restarted perfectly try the following command
#exportfs -> it should show the mounted directory for pxeos Image.
Then try it your problem will be solved.
imagename is not PXE Operating System

Error Message 1:# pxeos -a -i "centos5.4" -p NFS -D 0 -s 10.154.1.158 -L /export/centos5.4/ centos5.4
Traceback (most recent call last):
  File "/usr/sbin/pxeos", line 594, in ?
    status = pxe.updatePXE()
  File "/usr/sbin/pxeos", line 277, in updatePXE
    self.__getRemoteFile("vmlinuz")
  File "/usr/sbin/pxeos", line 234, in __getRemoteFile
    mkdir(localmnt)
  File "/usr/share/system-config-netboot/netboot_util.py", line 24, in mkdir
    raise err
OSError: [Errno 30] Read-only file system: '/mnt/centos5.4'
Solution : umount mounted iso from /mnt then the problem has been resolved.

Error Message 2:# pxeboot -a -O centos5.4 -K nfs:10.154.1.158:/export/centos5.4/testks.cfg -r 10000 10.154.1.0 -e eth0
Traceback (most recent call last):
  File "/usr/sbin/pxeboot", line 562, in ?
    pxe=pxeboot(ip)
  File "/usr/sbin/pxeboot", line 63, in __init__
    ip=socket.gethostbyname(val)
socket.gaierror: (-3, 'Temporary failure in name resolution').
Solution: just take the -e eth0 parameter, then the problem got solved.

Error Message 3:# pxeos -a -i "centos6.4" -p NFS -D 0 -s 10.154.1.160 -L /export/centos6.4/ centos6.4
You must enter directory of the Operating System Software
This directory must include the images/pxeboot directories
Error Mounting: mount.nfs: Connection timed out
Solution :This problem occur due to the nfs issue.
Try to resolve the nfs issue then the problem will be resolved.