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NCL cnFillOn strange problem

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New member
I'm new on WRF. Today i've finished my first run and all went good. When i try to plot the data, they are displayed only if they are vector or line, but they aren't showed when they are color. I think that is a res@cnFillOn problem or some setting in .hluresfile. I attach here the ncl script, the .hluresfile and the final plot. Sorry for the stupid question but i'm new on this.
View attachment wrf_demo_plot_slp.pdf

*wkColorMap: BlAqGrYeOrReVi200
*wkBackgroundColor: white
*wkForegroundColor: black
*FuncCode: ~
*TextFuncCode: ~
*Font : helvetica
*wkWidth: 900
*wkHeight: 900

ncl script
a = addfile("wrfout_d01_2020-06-09_15:00:00","r")
slp= wrf_user_getvar(a,"slp",0) ; Sea-level-pressure(hPa)
wks= gsn_open_wks("pdf","wrf_demo_plot_slp")
res = True
res@cnFillOn = True
contour = wrf_contour(a,wks,slp,res)
plot = wrf_map_overlays(a,wks,contour,False,False)
I've risolved this problem but i have another question: how can i put on the plot the state and province border? Thank you very much fort the patient but it's the first time for me
This example page has many examples of how to plot borders: