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Cannot assign to bound variable
com.sun.javafx.runtime.AssignToBoundException: Cannot assign to bound variable	at com.sun.javafx.runtime.location.IntVariable.setAsInt(IntVariable.java:111)	at javafx.ext.swing.SwingComboBox.set$selectedIndex(SwingComboBox.fx:118)	at javafx.ext.swing.SwingComboBox.updateSelectedIndexFromSelectedItem(SwingComboBox.fx:166)	at javafx.ext.swing.SwingComboBox.set$selectedItem(SwingComboBox.fx:142)	at javafx.ext.swing.SwingComboBox.setModelSelection(SwingComboBox.fx:197)	at javafx.ext.swing.SwingComboBox$1ComboBoxModel$anon10.setSelectedItem(SwingComboBox.fx:264)	at javafx.ext.swing.SwingComboBox$JComboBoxImpl.setSelectedItem(SwingComboBox.fx:340)	at javax.swing.JComboBox.setSelectedIndex(JComboBox.java:622)	at javax.swing.plaf.basic.BasicComboBoxUI.selectNextPossibleValue(BasicComboBoxUI.java:1085)	at javax.swing.plaf.basic.BasicComboBoxUI$Actions.actionPerformed(BasicComboBoxUI.java:1444)	at javax.swing.SwingUtilities.notifyAction(SwingUtilities.java:1661)	at javax.swing.JComponent.processKeyBinding(JComponent.java:2860)	at javax.swing.JComponent.processKeyBindings(JComponent.java:2906)	at javax.swing.JComponent.processKeyEvent(JComponent.java:2823)	at javax.swing.JComboBox.processKeyEvent(JComboBox.java:1416)	at java.awt.Component.processEvent(Component.java:5876)	at java.awt.Container.processEvent(Container.java:2109)	at java.awt.Component.dispatchEventImpl(Component.java:4460)	at java.awt.Container.dispatchEventImpl(Container.java:2167)	at java.awt.Component.dispatchEvent(Component.java:4286)	at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1879)	at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:742)	at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:1007)	at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:879)	at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:706)	at java.awt.Component.dispatchEventImpl(Component.java:4330)	at java.awt.Container.dispatchEventImpl(Container.java:2167)