overlay error

Hi all,
    I can separately produce two plots. However, when I wrote overlay(plot1, plot2) to run script, NCL mentioned the following error and no plot can be produced.
 fatal:NhlAddOverlay: plot class mapPlotClass cannot be overlay plot member.
Anyone knows what's wrong.

2008-10-31

Guanghua Chen

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Received on Fri Oct 31 2008 - 02:01:23 MDT