java.lang.UnsupportedOperationException: HTML

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java.lang.UnsupportedOperationException: HTML
at net.sourceforge.plantuml.ugraphic.ImageBuilder.createUGraphic(
at net.sourceforge.plantuml.ugraphic.ImageBuilder.writeImageTOBEMOVED(
at net.sourceforge.plantuml.ugraphic.ImageBuilder.writeImageTOBEMOVED(
at net.sourceforge.plantuml.UmlDiagram.exportDiagramError2(
at net.sourceforge.plantuml.UmlDiagram.exportDiagramError(
at net.sourceforge.plantuml.UmlDiagram.exportDiagram(
at net.sourceforge.plantuml.PSystemUtils.exportDiagramsSequence(
at net.sourceforge.plantuml.PSystemUtils.exportDiagrams(
at net.sourceforge.plantuml.SourceFileReader.getGeneratedImages(
at net.sourceforge.plantuml.Run.manageFileInternal(
at net.sourceforge.plantuml.Run.processArgs(
at net.sourceforge.plantuml.Run.manageAllFiles(

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