Problems with XY plot

Hi,

I have 1000 pdfs with each having 12 bin centers. I am trying to plot it
as mark lines so I can see the spreads of the points at each bin center.
But it is giving me this error:

warning:LegendSetValues: lgLabelStrings exceeds maximum number of
elements, 256: ignoring
warning:LegendSetValues: lgLineLabelFontColors exceeds maximum number of
elements, 256: ignoring

is it something because I am plotting too many pdfs?
Here are the resources that I am using:

ires = True

ires@gsnDraw = False
ires@gsnFrame = True
ires@gsnCenterString = ""

ires@xyLineThicknessF = 2
ires@xyDashPattern = 8
ires@xyMarkLineMode = "MarkLines"

ires@tiYAxisString = ""

ires@tmXBLabelFont = 5
ires@tmYLLabelFont = 4
ires@tmYROn = False
ires@tmYRBorderOn = False
ires@tmXTBorderOn = False
ires@tmXTOn = False

ires@trYMinF = 0
ires@trYMaxF = 50

Thanks,
Soumik

-- 
"Numbing the pain for a while will make it worse when you finally feel 
it.
~J.K. Rowling"
*****************************************
Soumik Basu
Graduate Student, Research Assistant
International Arctic Research Center
University of Alaska Fairbanks
Fairbanks,Alaska,USA
*****************************************
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