can't understand error message

Hello NCL-talk,

I'm trying to create a contour plot with the variable time on the
abscissa and height on the ordinate. The contours represent the target
classification of cloud particles.
Compiling my code, I get an error message I can't understand.
Maybe one of you ist able to help me, that would be great!

My code is as follows:

;************************************************************
; Target Classification 2D
;************************************************************

;************************************************************
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

a=addfile("/localdata/Lohmueller/BA/Daten_Lindenberg/Classification/20130101_lindenberg_classification.nc",
"r")

time=a->time
tar=a->target_classification
height=a->height

;print(tar(2,:))

wks= gsn_open_wks("pdf","Target")

slice=tar(:,:)

;print(slice(2,:))

   gsn_define_colormap(wks,"BlGrYeOrReVi200")

   res = True

   res@gsnMaximize = True
   res@gsnPaperOrientation = "landscape"
   res@cnFillOn = True
   res@cnCellFillEdgeColor = "black"
   res@cnFillMode = "CellFill"
   res@cnLinesOn = False
   res@cnLineLabelsOn = False
   res@cnLevelSelectionMode = "ManualLevels" ; set manual
contour levels
   res@cnMinLevelValF = 0. ; set the minimum contour level
   res@cnMaxLevelValF = 10. ; set the maximum contour level
   res@cnConstFLabelConstantSpacingF = 1
   res@cnFillColors = (/2,18,39,63,79,96,127,159,175,191,201/)
        ; set the colors to be used
   res@cnLevelSpacingF = 1

   res@lbLabelAutoStride = True
   res@lbPerimOn = False
   res@lbLabelStride = 2

   res@tiMainString = ""

   ;res@trGridType = "TriangularMesh"

;plot=gsn_xy(wks,time, height, False)
time2=new(dimsizes(time),typeof(time))
height2=new(dimsizes(height),typeof(height))

time2=time
height2=height

;print(time2)

     res@sfXArray = time2
     res@sfYArray = height2

contour = gsn_csm_contour(wks,slice,res)

end

And the error message:
warning:ScalarFieldSetValues: coordinate array sfXArray requires 496
elements: defaulting
warning:ScalarFieldSetValues: coordinate array sfYArray requires 2879
elements: defaulting

Thank you,
Katja

-- 
Katja Lohmüller
Institut fuer Meteorologie und Klimatologie
Leibniz Universitaet Hannover
Herrenhaeuser Str. 2
30419 Hannover
Email: lohmueller@muk.uni-hannover.de
Mobil: 0049 176 61396963
Buero: 0049 511 762 2396
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