java.util.List: This exception has no message.

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java.util.List:
at fr.opensagres.xdocreport.document.tools.json.FieldsMetadataJSONSerializer.toMap(FieldsMetadataJSONSerializer.java:129)
at fr.opensagres.xdocreport.document.tools.json.FieldsMetadataJSONSerializer.toMap(FieldsMetadataJSONSerializer.java:91)
at fr.opensagres.xdocreport.document.tools.json.FieldsMetadataJSONSerializer.save(FieldsMetadataJSONSerializer.java:71)
at fr.opensagres.xdocreport.document.tools.json.FieldsMetadataJSONSerializer.save(FieldsMetadataJSONSerializer.java:65)
at fr.opensagres.xdocreport.document.tools.json.JSONDataProviderFactory.generateDefaultData(JSONDataProviderFactory.java:57)
at fr.opensagres.xdocreport.document.tools.DataProviderFactoryRegistry.generateDefaultData(DataProviderFactoryRegistry.java:93)
at fr.opensagres.xdocreport.document.tools.Main.process(Main.java:196)
at fr.opensagres.xdocreport.document.tools.Main.main(Main.java:122)

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