VVECTR - VECTOR NDC LENGTH TOO GREAT

Dear friemd £º
When I run the script(the script which Iused is attached to the letter.) to plot
fields from a Global WRF run.I got the message as follow :
"
fatal:VectorPlotDraw: VVECTR - VECTOR NDC LENGTH TOO GREAT
fatal:VectorPlotDraw: error drawing vectors
fatal:VectorPlotDraw: draw error
fatal:PlotManagerDraw: error in plot draw
fatal:_NhlPlotManagerDraw: Draw error
fatal:VectorPlotDraw: VVECTR - VECTOR NDC LENGTH TOO GREAT
fatal:VectorPlotDraw: error drawing vectors
fatal:VectorPlotDraw: draw error
fatal:PlotManagerDraw: error in plot draw
fatal:_NhlPlotManagerDraw: Draw error
fatal:VectorPlotDraw: VVECTR - VECTOR NDC LENGTH TOO GREAT
fatal:VectorPlotDraw: error drawing vectors
fatal:VectorPlotDraw: draw error
fatal:PlotManagerDraw: error in plot draw
fatal:_NhlPlotManagerDraw: Draw error
fatal:VectorPlotDraw: VVECTR - VECTOR NDC LENGTH TOO GREAT
fatal:VectorPlotDraw: error drawing vectors
fatal:VectorPlotDraw: draw error
fatal:PlotManagerDraw: error in plot draw
fatal:_NhlPlotManagerDraw: Draw error
fatal:VectorPlotDraw: VVECTR - VECTOR NDC LENGTH TOO GREAT
fatal:VectorPlotDraw: error drawing vectors
fatal:VectorPlotDraw: draw error
fatal:PlotManagerDraw: error in plot draw
fatal:_NhlPlotManagerDraw: Draw error
warning:ContourPlotInitialize: scalar field is constant; ContourPlot not
possible:[errno=1102]
warning:ContourPlotSetValues: Data values out of range of levels set by
EXPLICITLEVELS mode
warning:ContourPlotInitialize: scalar field is constant; ContourPlot not
possible:[errno=1102]
warning:ContourPlotSetValues: Data values out of range of levels set by
EXPLICITLEVELS mode
warning:ContourPlotInitialize: scalar field is constant; ContourPlot not
possible:[errno=1102]
warning:ContourPlotSetValues: Data values out of range of levels set by
EXPLICITLEVELS mode
warning:ContourPlotInitialize: scalar field is constant; ContourPlot not
possible:[errno=1102]
warning:ContourPlotSetValues: Data values out of range of levels set by
EXPLICITLEVELS mode
warning:ContourPlotInitialize: scalar field is constant; ContourPlot not
possible:[errno=1102]
warning:ContourPlotSetValues: Data values out of range of levels set by
EXPLICITLEVELS mode
warning:ContourPlotInitialize: scalar field is constant; ContourPlot not
possible:[errno=1102]
warning:ContourPlotSetValues: Data values out of range of levels set by
EXPLICITLEVELS mode
warning:ContourPlotInitialize: scalar field is constant; ContourPlot not
possible:[errno=1102]
warning:ContourPlotSetValues: Data values out of range of levels set by
EXPLICITLEVELS mode
"
What should I do ?
Give my best wishes to ncl.

                                                        Yours sincerely
                                                        sun chao
                                                        lzu

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