An error has occured: java.lang.UnsupportedOperationException: class net.sourceforge.plantuml.svek.extremity.ExtremityFactoryCrowfoot
net.sourceforge.plantuml.svek.AbstractExtremityFactory.createUDrawable(AbstractExtremityFactory.java:46)
net.sourceforge.plantuml.svek.Line.getExtremity(Line.java:474)
net.sourceforge.plantuml.svek.Line.solveLine(Line.java:555)
net.sourceforge.plantuml.svek.DotStringFactory.solve(DotStringFactory.java:429)
net.sourceforge.plantuml.svek.DotDataImageBuilder.buildImage(DotDataImageBuilder.java:202)
net.sourceforge.plantuml.svek.CucaDiagramFileMakerSvek.createFileInternal(CucaDiagramFileMakerSvek.java:104)
net.sourceforge.plantuml.svek.CucaDiagramFileMakerSvek.createFile(CucaDiagramFileMakerSvek.java:70)
net.sourceforge.plantuml.svek.cucadiagram.DucaDiagram.exportDiagramInternal(CucaDiagram.java:339)
net.sourceforge.plantuml.svek.classdiagram.DucaDiagram.exportDiagramInternal(ClassDiagram.java:207)
net.sourceforge.plantuml.svek.mlDiagram.exportDiagramNow(UmlDiagram.java:237)