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)

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