NCL画流场，小白求问大神这是怎么回事呀

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NCAR Command Language Version 6.4.0

The use of this software is governed by a License Agreement.

[backcolor=rgba(0, 0, 0, 0.85098)] See http://www.ncl.ucar.edu/ for more details.

[backcolor=rgba(0, 0, 0, 0.85098)]fatal:["NclFile.c":2100]:Subscript out of range, error in subscript #1

[backcolor=rgba(0, 0, 0, 0.85098)]fatal:["Execute.c":8640]:Execute: Error occurred at or near line 10 in file uv.ncl

[backcolor=rgba(0, 0, 0, 0.85098)]  1 load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"

[backcolor=rgba(0, 0, 0, 0.85098)]  2 load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"

[backcolor=rgba(0, 0, 0, 0.85098)]  3 load "$NCARG_ROOT/lib/ncarg/nclscripts/wrf/WRFUserARW.ncl"

[backcolor=rgba(0, 0, 0, 0.85098)]  4 begin

[backcolor=rgba(0, 0, 0, 0.85098)]  5 dir="/home/knqian/201611/"

[backcolor=rgba(0, 0, 0, 0.85098)]  6 fname = "wrfout_d03_2016-11-15_00:00:00"

[backcolor=rgba(0, 0, 0, 0.85098)]  7 f=addfile(dir+fname,"r")

[backcolor=rgba(0, 0, 0, 0.85098)]  8 ;u1= f->U(:,0,:,:)

[backcolor=rgba(0, 0, 0, 0.85098)]  9 ;print(u1)

[backcolor=rgba(0, 0, 0, 0.8509u= f->U(8,1000,:,:)

[backcolor=rgba(0, 0, 0, 0.85098) v= f->V(8,1000,:,:)

[backcolor=rgba(0, 0, 0, 0.85098)12 ;u=wrf_user_getvar(f,U,8)

[backcolor=rgba(0, 0, 0, 0.85098) 13 ;v=wrf_user_getvar(f,V,8)

[backcolor=rgba(0, 0, 0, 0.85098)] 14 type="pdf"

[backcolor=rgba(0, 0, 0, 0.85098)] 15 name="uv"

[backcolor=rgba(0, 0, 0, 0.85098)] 16 wks=gsn_open_wks(type,name)

[backcolor=rgba(0, 0, 0, 0.85098)] 17 res=True

[backcolor=rgba(0, 0, 0, 0.85098) 18 res@stLineThicknessF = 5.0

[backcolor=rgba(0, 0, 0, 0.85098)] 19 res@stLineColor = "NavyBlue"

[backcolor=rgba(0, 0, 0, 0.85098)] 20 plot=gsn_csm_streamline(wks,u,v,res)

[backcolor=rgba(0, 0, 0, 0.85098)] 21 frame(wks)

[backcolor=rgba(0, 0, 0, 0.85098)] 22 end

[backcolor=rgba(0, 0, 0, 0.85098)] 23

[backcolor=rgba(0, 0, 0, 0.85098)]"uv.ncl" 23L, 560C                                                   

[backc用wrf_user_getvar是不是不能提取啊，因为我还需要固定层数，而且用了这个函数也是错误的