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java.lang.ClassCastException: java.lang.Double cannot be cast to java.lang.String at java.lang.String.compareTo(String.java:111) at java.util.TreeMap.put(TreeMap.java:568) at java.util.TreeSet.add(TreeSet.java:255) at figtree.treeviewer.decorators.DiscreteColourDecorator.setAttributes(DiscreteColourDecorator.java:107) at figtree.treeviewer.decorators.ColourDecorator.<init>(ColourDecorator.java:54) at figtree.treeviewer.decorators.DiscreteColourDecorator.<init>(DiscreteColourDecorator.java:88) at figtree.treeviewer.decorators.HSBDiscreteColourDecorator.<init>(HSBDiscreteColourDecorator.java:61) at figtree.treeviewer.AttributeColourController.getDecoratorForAttribute(AttributeColourController.java:171) at figtree.treeviewer.AttributeColourController.getColourDecorator(AttributeColourController.java:142) at figtree.treeviewer.painters.LegendPainterController$1.attributeComboChanged(LegendPainterController.java:106) at figtree.treeviewer.painters.AttributeComboHelper.fireAttributeSelectionChanged(AttributeComboHelper.java:293) at figtree.treeviewer.painters.AttributeComboHelper.access$200(AttributeComboHelper.java:46) at figtree.treeviewer.painters.AttributeComboHelper$2.actionPerformed(AttributeComboHelper.java:141)