java.lang.AssertionError: This exception has no message.

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java.lang.AssertionError:
at com.oracle.javafx.scenebuilder.kit.editor.panel.inspector.editors.AnchorPaneConstraintsEditor$ConstraintEditor.getValueEditor(AnchorPaneConstraintsEditor.java:281)
at com.oracle.javafx.scenebuilder.kit.editor.panel.inspector.InspectorPanelController.setEditorValueFromSelection(InspectorPanelController.java:1330)
at com.oracle.javafx.scenebuilder.kit.editor.panel.inspector.InspectorPanelController.getInitializedPropertiesEditor(InspectorPanelController.java:791)
at com.oracle.javafx.scenebuilder.kit.editor.panel.inspector.InspectorPanelController.buildSection(InspectorPanelController.java:763)
at com.oracle.javafx.scenebuilder.kit.editor.panel.inspector.InspectorPanelController.handleTitledPane(InspectorPanelController.java:1703)
at com.oracle.javafx.scenebuilder.kit.editor.panel.inspector.InspectorPanelController.lambda$controllerDidLoadFxml$140(InspectorPanelController.java:562)
at com.sun.javafx.binding.ExpressionHelper$Generic.fireValueChangedEvent(ExpressionHelper.java:361)
at com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:81)
at javafx.beans.property.BooleanPropertyBase.fireValueChangedEvent(BooleanPropertyBase.java:103)
at javafx.beans.property.BooleanPropertyBase.markInvalid(BooleanPropertyBase.java:110)
at javafx.beans.property.BooleanPropertyBase.set(BooleanPropertyBase.java:144)
at com.sun.javafx.scene.control.behavior.TitledPaneBehavior.toggle(TitledPaneBehavior.java:98)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)

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