ImportError: No module named lxml

[Hossam <hossam.taqi@telepin.com>]

Dears  ,

i need  you support  as    i got  the  following error :

  #xm new -f 
/OVS/Repositories/0004fb0000030000505b685a936d0faf/VirtualMachines/0004fb00000600001dfb6cf4b6258355/vm.cfg
Unexpected error: exceptions.ImportError

Please report to xen-devel@lists.xensource.com
Traceback (most recent call last):
   File "/usr/sbin/xm", line 7, in ?
     main.main(sys.argv)
   File "/usr/lib64/python2.4/site-packages/xen/xm/main.py", line 3983, 
in main
     _, rc = _run_cmd(cmd, cmd_name, args)
   File "/usr/lib64/python2.4/site-packages/xen/xm/main.py", line 4007, 
in _run_cmd
     return True, cmd(args)
   File "<string>", line 1, in <lambda>
   File "/usr/lib64/python2.4/site-packages/xen/xm/main.py", line 1518, 
in xm_importcommand
     cmd = __import__(command, globals(), locals(), 'xen.xm')
   File "/usr/lib64/python2.4/site-packages/xen/xm/new.py", line 26, in ?
     from xen.xm.xenapi_create import *
   File "/usr/lib64/python2.4/site-packages/xen/xm/xenapi_create.py", 
line 25, in ?
     from lxml import etree
ImportError: No module named lxml


Thank you in advance ,
Regards,
Hossam