Error in plotting the marker

I am confused with this error. "Sometimes" I got the following error, but
sometimes it just works fine.
fatal:Execute: Error occurred at or near line 144 which is for *"new_index*"
line:

*[snip]*

 mstring = "D"
 fontnum = 34
 xoffset = 0.0
 yoffset = 0.0
 ratio = 1.0
 size = 3.0
 angle = 0.0

* new_index = NhlNewMarker (wks,mstring,fontnum, xoffset, yoffset, ratio,
size, angle)* <----------------

 mkres = True
 mkres@gsMarkerIndex = new_index
 dum = gsn_add_polymarker(wks, plot,(/-150,90/),(/8,-3/),mkres)

 draw(plot)
 frame(wks)

I do not know, everything seems OK.
I cant find the mistake in those lines..

A.Farsyud

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Received on Mon Jan 21 07:46:05 2013