warning:NhlDraw: cannot draw Plot Member, ID 68, independently

Hello
 When I tried to overlay contour over a shaded one I am getting the
following warning...What is mean by this warning? Can I neglect it?
warning:NhlDraw: cannot draw Plot Member, ID 68, independently

Any help would be appreciated...

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Received on Tue Sep 08 2009 - 06:44:33 MDT