str_lower problem in NCL script!

Dear Sir

Good Day!

I am nowadays working on WRF 3.1 for precipitation prediction. I am using the example script of wrf_Height_Final.ncl. But when I run the script it giving the following error. I did my best to fix this error but I am unsuccessful. I would be deeply grateful if you can plz help me for this problem. The all required files have been attached also.

ERROR is as follows:

(0) convert -depth 8 -rotate -90 -density 144 /home/crm/WRF/WRFV3/test/em_real/tmp/tiffcap3_0002.ps tiff:/home/crm/
WRF/WRFV3/test/em_real/tmp/tiffcap3_0002.tiff
(0) changeCase: this function has been deprecated.
(0) Will use str_lower or str_upper.
fatal:Undefined identifier: (str_lower) is undefined, can't continue
fatal:Execute: Error occurred at or near line 872 in file $NCARG_ROOT/
lib/ncarg/nclscripts/csm/contributed.ncl
fatal:Execute: Error occurred at or near line 470 in file wrf2geotiff.
ncl
fatal:Execute: Error occurred at or near line 121 in file wrf_Height_
Final.ncl

Waiting for your kind reply!
Best regards
Raza

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