add new poly Marker

Dear all ncl users

  I try to draw a new marker onto my map by using gsn_add_polymarker.
  But when I use function "NhlNewMarker" , the systerm says this line is
error occurred.

   first = True
   new_index = NhlNewMarker(wks,"p",137,0.0,0.0,1.3125,1.5,0.0)
   first@gsMarkerIndex = new_index
   first@gsMarkerSizeF = 0.008
   first@gsMarkerColor = "Black"

   plot=gsn_csm_contour_map_ce(wks,sst(n,{minLat:maxLat},{minLon:maxLon}),res)
   dmark = gsn_add_polymarker(wks,plot,lonm(1),latm(1),first)

   Do you have any idea what did I do wrong?

   Thanks

stera

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