Problem Regardsing TickMarks

I am very new to NCL and I am trying to plot a contour of Topography (topo) data. Following is a section of the code which i wrote for it.

    wks_type        =    "png"
    wks_type@wkWidth    =    2400
    wks_type@wkHeight    =    2400
      wks               =     gsn_open_wks("png","plot_etopo2")
      gsn_define_colormap(wks,"amwg256")

      res                           =     True
      res@gsnFrame                  =     True
      res@gsnMaximize               =     True
      res@gsnAddCyclic              =     False
      res@gsnSpreadColors           =     True
      res@gsnSpreadColorStart       =     -1
      res@gsnSpreadColorEnd         =     2

      res@mpLimitMode               =     "LatLon"
      res@mpMinLatF                 =     min(lat)
      res@mpMaxLatF                 =     max(lat)
      res@mpMinLonF                 =     min(lon)
      res@mpMaxLonF                 =     max(lon)
      res@mpLandFillColor           =     "Gray"
      res@mpDataBaseVersion         =     "MediumRes"

      res@cnFillOn                  =     True
      res@cnInfoLabelOn             =     False
      res@cnLinesOn                 =     False
      res@cnLevelSelectionMode      =     "ManualLevels"
      res@cnMinLevelValF            =     -5400.0
      res@cnMaxLevelValF            =      4000.0
      res@cnLevelSpacingF           =       500.0

      res@tmXBMode                  =     "Manual"
      res@tmXBTickStartF            =    -10.0
      res@tmXBTickEndF              =     38.0
      res@tmXBTickSpacingF          =      1.0
     
      res@tmYLMode            =    "Manual"
      res@tmYLTickStartF        =    30.0
      res@tmYLTickEndF            =    46.0
      res@tmYLTickSpacingF        =    1.0

      res@tiMainString              =     "Model Bathymetry from ETOPO5"
      res@lbLabelStride             =     4
      res@lbOrientation             =     "Vertical"
      res@lbBoxLinesOn              =     False

      plot  =     gsn_csm_contour_map(wks,topo,res)

While trying to plot, I am repeatedly encountering with the following error

warning:TickMarkSetValues: A tick mark spacing must be assigned for manual mode, defaulting bottom ticks to automatic
warning:TickMarkSetValues: A tick mark spacing must be assigned for manual mode, defaulting top ticks to automatic
warning:TickMarkSetValues: A tick mark spacing must be assigned for manual mode, defaulting left ticks to automatic
warning:TickMarkSetValues: A tick mark spacing must be assigned for manual mode, defaulting right ticks to automatic

Can any on help me in this regard

Regards

Srikanth

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Received on Fri Nov 23 05:07:40 2012