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[idvusers] Plotting isosurface with ISL failing

I'm attempting to create an ISL script to plot 3D isosurfaces with the
following xml snippet: (test.isl)

<isl debug="true">
  <datasource url="test.nc" type="netcdf.grid" times="0,1">
    <display param="aerosol_extinction" type="isosurface">
      <property name="levelWithRawValue" value="0.004"/>
    </display>
  </datasource>
  <image file="test.jpg" quality="1.0"/>
</isl>

I've been able to plot other 2D plots, but no 3D ones.
When attempting to run the script, I get two errors.  What am I doing
wrong?  (sample file at http://fuelberg.met.fsu.edu/pub/wsession/test.nc ,
26MB):

>>>./prgms/IDV_2.9/runIDV test.isl
Tue Jun 22 18:01:52 PDT 2010: Creating data source
Tue Jun 22 18:01:52 PDT 2010: Creating display: isosurface
param:aerosol_extinction
ERROR: Creating data instance for display: Isosurface
java.lang.NullPointerException
java.lang.NullPointerException
        at
ucar.unidata.idv.control.ThreeDSurfaceControl.addLabelMacros(ThreeDSurfaceControl.java:211)
        at
ucar.unidata.idv.control.DisplayControlImpl.applyMacrosToTemplate(DisplayControlImpl.java:3920)
        at
ucar.unidata.idv.control.DisplayControlImpl.getLegendLabels(DisplayControlImpl.java:3899)
        at
ucar.unidata.idv.control.ThreeDSurfaceControl.getLegendLabels(ThreeDSurfaceControl.java:612)
        at
ucar.unidata.idv.control.DisplayControlImpl.getLegendLabels(DisplayControlImpl.java:3775)
        at
ucar.unidata.idv.control.DisplayControlImpl.getTitle(DisplayControlImpl.java:3558)
        at
ucar.unidata.idv.control.DisplayControlImpl.initializeDataInstance(DisplayControlImpl.java:3090)
        at
ucar.unidata.idv.control.DisplayControlImpl.getDataInstance(DisplayControlImpl.java:3297)
        at
ucar.unidata.idv.control.DisplayControlImpl.getDataInstance(DisplayControlImpl.java:3281)
        at
ucar.unidata.idv.control.GridDisplayControl.getGridDataInstance(GridDisplayControl.java:128)
        at
ucar.unidata.idv.control.ThreeDSurfaceControl.getDataRealType(ThreeDSurfaceControl.java:398)
        at
ucar.unidata.idv.control.ThreeDSurfaceControl.convertRawToDisplay(ThreeDSurfaceControl.java:429)
        at
ucar.unidata.idv.control.ThreeDSurfaceControl.getWholeDisplayValue(ThreeDSurfaceControl.java:476)
        at
ucar.unidata.idv.control.ThreeDSurfaceControl.setLevelWithRawValue(ThreeDSurfaceControl.java:520)
        at
ucar.unidata.idv.control.ThreeDSurfaceControl.setLevelWithRawValue(ThreeDSurfaceControl.java:501)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at ucar.unidata.util.Misc.setProperty(Misc.java:480)
        at ucar.unidata.util.Misc.setProperty(Misc.java:390)
        at ucar.visad.Util.propertySet(Util.java:3148)
        at
ucar.unidata.idv.control.DisplayControlImpl.setProperty(DisplayControlImpl.java:2372)
        at
ucar.unidata.idv.control.DisplayControlImpl.applyProperties(DisplayControlImpl.java:2163)
        at
ucar.unidata.idv.control.DisplayControlImpl.init(DisplayControlImpl.java:1000)
        at
ucar.unidata.idv.ControlDescriptor.initControl(ControlDescriptor.java:986)
        at
ucar.unidata.idv.ControlDescriptor.doMakeDisplay(ControlDescriptor.java:916)
        at
ucar.unidata.idv.IntegratedDataViewer.doMakeControl(IntegratedDataViewer.java:2600)
        at
ucar.unidata.idv.ui.ImageGenerator.processDisplayNode(ImageGenerator.java:2876)
        at
ucar.unidata.idv.ui.ImageGenerator.processTagDatasource(ImageGenerator.java:1733)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at
ucar.unidata.idv.ui.ImageGenerator.processNode(ImageGenerator.java:919)
        at
ucar.unidata.idv.ui.ImageGenerator.processChildren(ImageGenerator.java:953)
        at
ucar.unidata.idv.ui.ImageGenerator.processTagGroup(ImageGenerator.java:2465)
        at
ucar.unidata.idv.ui.ImageGenerator.processTagIsl(ImageGenerator.java:2419)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at
ucar.unidata.idv.ui.ImageGenerator.processNode(ImageGenerator.java:919)
        at
ucar.unidata.idv.ui.ImageGenerator.processScriptFile(ImageGenerator.java:832)
        at
ucar.unidata.idv.ui.ImageGenerator.processScriptFile(ImageGenerator.java:756)
        at
ucar.unidata.idv.ui.ImageGenerator.processScriptFiles(ImageGenerator.java:740)
        at ucar.unidata.idv.ArgsManager$1.run(ArgsManager.java:407)
        at
ucar.unidata.idv.ArgsManager.runInitRunnables(ArgsManager.java:454)
        at ucar.unidata.idv.ArgsManager.access$000(ArgsManager.java:73)
        at ucar.unidata.idv.ArgsManager$3.run(ArgsManager.java:433)
        at ucar.unidata.util.Misc$3.run(Misc.java:1089)
ERROR: Setting property:levelWithRawValue value= 4E-4
java.lang.NullPointerException
java.lang.NullPointerException
        at
ucar.unidata.idv.control.ThreeDSurfaceControl.getDataRealType(ThreeDSurfaceControl.java:398)
        at
ucar.unidata.idv.control.ThreeDSurfaceControl.convertRawToDisplay(ThreeDSurfaceControl.java:429)
        at
ucar.unidata.idv.control.ThreeDSurfaceControl.getWholeDisplayValue(ThreeDSurfaceControl.java:476)
        at
ucar.unidata.idv.control.ThreeDSurfaceControl.setLevelWithRawValue(ThreeDSurfaceControl.java:520)
        at
ucar.unidata.idv.control.ThreeDSurfaceControl.setLevelWithRawValue(ThreeDSurfaceControl.java:501)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at ucar.unidata.util.Misc.setProperty(Misc.java:480)
        at ucar.unidata.util.Misc.setProperty(Misc.java:390)
        at ucar.visad.Util.propertySet(Util.java:3148)
        at
ucar.unidata.idv.control.DisplayControlImpl.setProperty(DisplayControlImpl.java:2372)
        at
ucar.unidata.idv.control.DisplayControlImpl.applyProperties(DisplayControlImpl.java:2163)
        at
ucar.unidata.idv.control.DisplayControlImpl.init(DisplayControlImpl.java:1000)
        at
ucar.unidata.idv.ControlDescriptor.initControl(ControlDescriptor.java:986)
        at
ucar.unidata.idv.ControlDescriptor.doMakeDisplay(ControlDescriptor.java:916)
        at
ucar.unidata.idv.IntegratedDataViewer.doMakeControl(IntegratedDataViewer.java:2600)
        at
ucar.unidata.idv.ui.ImageGenerator.processDisplayNode(ImageGenerator.java:2876)
        at
ucar.unidata.idv.ui.ImageGenerator.processTagDatasource(ImageGenerator.java:1733)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at
ucar.unidata.idv.ui.ImageGenerator.processNode(ImageGenerator.java:919)
        at
ucar.unidata.idv.ui.ImageGenerator.processChildren(ImageGenerator.java:953)
        at
ucar.unidata.idv.ui.ImageGenerator.processTagGroup(ImageGenerator.java:2465)
        at
ucar.unidata.idv.ui.ImageGenerator.processTagIsl(ImageGenerator.java:2419)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at
ucar.unidata.idv.ui.ImageGenerator.processNode(ImageGenerator.java:919)
        at
ucar.unidata.idv.ui.ImageGenerator.processScriptFile(ImageGenerator.java:832)
        at
ucar.unidata.idv.ui.ImageGenerator.processScriptFile(ImageGenerator.java:756)
        at
ucar.unidata.idv.ui.ImageGenerator.processScriptFiles(ImageGenerator.java:740)
        at ucar.unidata.idv.ArgsManager$1.run(ArgsManager.java:407)
        at
ucar.unidata.idv.ArgsManager.runInitRunnables(ArgsManager.java:454)
        at ucar.unidata.idv.ArgsManager.access$000(ArgsManager.java:73)
        at ucar.unidata.idv.ArgsManager$3.run(ArgsManager.java:433)
        at ucar.unidata.util.Misc$3.run(Misc.java:1089)
Tue Jun 22 18:01:58 PDT 2010: Writing image:test.jpg
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