error with ncl command

Dear sir
     i'm successfully installed the ncl_ncarg-5.1.1 in my IBM-AIX server.
when i'm tring to type the command for my WRF model output visualization it
gives the following error. I don't understand what may be this error. kindly
help me in this regards.

versa/Deepak>ncl plot_cost_grad_fn.ncl
 Copyright (C) 1995-2009 - All Rights Reserved
 University Corporation for Atmospheric Research
 NCAR Command Language Version 5.1.1
 The use of this software is governed by a License Agreement.
 See http://www.ncl.ucar.edu/ for more details.
Illegal instruction (core dumped)
versa/Deepak>

Thanking you
with regards
Dipak sahu, IIT Delhi

-- 
********************************************
Dipak kumar Sahu,
Research Scholar,
Centre for Atmospheric Sciences.,
Indian Institute of Technology,Delhi
email:- dipak_math@yahoo.com
**********************************************

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Received on Mon Aug 23 22:44:37 2010