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[netcdf-java] error trying to create union...

Hi,

Does anybody know what this means:


java.lang.IllegalArgumentException: VariableDS must not wrap a Structure; name=Level 1B Swath Metadata
     [java]     at ucar.nc2.dataset.VariableDS.<init>(VariableDS.java:157)
[java] at ucar.nc2.dataset.DatasetConstructor.transferGroup(DatasetConstructor.java:88) [java] at ucar.nc2.dataset.DatasetConstructor.transferDataset(DatasetConstructor.java:58) [java] at ucar.nc2.ncml.AggregationUnion.buildNetcdfDataset(AggregationUnion.java:66)
     [java]     at ucar.nc2.ncml.Aggregation.finish(Aggregation.java:408)
     [java]     at ucar.nc2.ncml.NcMLReader.readNetcdf(NcMLReader.java:487)
     [java]     at ucar.nc2.ncml.NcMLReader.readNcML(NcMLReader.java:432)
     [java]     at ucar.nc2.ncml.NcMLReader.readNcML(NcMLReader.java:350)
     [java]     at ucar.nc2.ncml.NcMLReader.readNcML(NcMLReader.java:282)



I'm trying to create a union aggregation between two files.

Tom