Plotting problem

Hello,

I have a data file as below:

When I ran the plotting sripts, the following errors occured:

I greatly appreciate if anyone can help tell what is wrong with the scripts (see below).

Lifen Jiang
-------------------------------------------------------------------
;************************************************
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/contributed.ncl"
;************************************************
begin
;************************************************
; open file and read in data
;************************************************
  in = addfile("med_c0.nc","r")
  t = in->med_c0
  printVarSummary(t)
  
  t@_FillValue = -32768
  t@missing_value = t@_FillValue
  
  t = lonFlip(t) ; reorder
;************************************************
; create plot
;************************************************
  wks = gsn_open_wks("pdf" ,"Olson") ;
  gsn_define_colormap(wks,"rainbow") ; choose colormap
  res = True ; plot mods desired
  res@cnFillOn = True ; turn on color fill
  res@cnLinesOn = False ; turn of contour lines
  res@cnLevelSpacingF = 0.5 ; contour spacing
;---This resource not needed in NCL V6.1.0
  res@gsnSpreadColors = True ; use full range of color map
  res@lbLabelStride = 4
  res@pmTickMarkDisplayMode = "Always"; use NCL default lat/lon labels
  res@gsnAddCyclic = False ; data already has cyclic point
       ; this must also be set for any zoom
; note that the gsn_csm_*map_ce templates automatically set
; res@mpLimitMode="LatLon" for you. If you are plotting a different projection,
; you may have to set this resource.
  res@mpMinLatF = -90 ; range to zoom in on
  res@mpMaxLatF = 90
  res@mpMinLonF = -180
  res@mpMaxLonF = 180
  plot = gsn_csm_contour_map_ce(wks,t({-90:90},{-180:180}), res)
;************************************************
end

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