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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)