[ncl-install] WRF plot problem

[GATOTO Placide]

I am learning how to use WRF model. When I run $ ncl util/plotgrids_new.ncl I get this error. 
Copyright (C) 1995-2019 - All Rights Reserved University Corporation for Atmospheric Research NCAR Command Language Version 6.6.2 The use of this software is governed by a License Agreement. See http://www.ncl.ucar.edu/ for more details.fatal:Could not open ($NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl)fatal:error at line 7 in file util/plotgrids_new.ncl.
Any one to help me to fix this issue.
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