java.lang.UnsupportedOperationException: HTML

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java.lang.UnsupportedOperationException: HTML
at net.sourceforge.plantuml.ugraphic.ImageBuilder.createUGraphic(ImageBuilder.java:263)
at net.sourceforge.plantuml.ugraphic.ImageBuilder.writeImageTOBEMOVED(ImageBuilder.java:146)
at net.sourceforge.plantuml.ugraphic.ImageBuilder.writeImageTOBEMOVED(ImageBuilder.java:127)
at net.sourceforge.plantuml.sequencediagram.graphic.SequenceDiagramFileMakerPuma2.createOne(SequenceDiagramFileMakerPuma2.java:237)
at net.sourceforge.plantuml.sequencediagram.SequenceDiagram.exportDiagramInternal(SequenceDiagram.java:220)
at net.sourceforge.plantuml.UmlDiagram.exportDiagram(UmlDiagram.java:229)
at net.sourceforge.plantuml.PSystemUtils.exportDiagramsSequence(PSystemUtils.java:176)
at net.sourceforge.plantuml.PSystemUtils.exportDiagrams(PSystemUtils.java:66)
at net.sourceforge.plantuml.SourceFileReader.getGeneratedImages(SourceFileReader.java:210)
at net.sourceforge.plantuml.Run.manageFileInternal(Run.java:394)
at net.sourceforge.plantuml.Run.processArgs(Run.java:316)
at net.sourceforge.plantuml.Run.manageAllFiles(Run.java:291)

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