java.lang.IllegalArgumentException: illegal assignment of group.content: group=Group node=ApplicationContent [id=ApplicationContent]

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java.lang.IllegalArgumentException: illegal assignment of group.content: group=Group node=ApplicationContent [id=ApplicationContent]
at javafx.scene.Group$_SBECL.onChange(Group.fx:209)
at com.sun.javafx.runtime.location.SequenceVariable.notifyListeners(SequenceVariable.java:157)
at com.sun.javafx.runtime.location.SequenceVariable.setAsSequence(SequenceVariable.java:259)
at com.sun.javafx.runtime.location.SequenceVariable.set(SequenceVariable.java:222)
at com.sun.javafx.runtime.location.SequenceVariable.set(SequenceVariable.java:39)
at com.sun.javafx.runtime.location.Bindings$BijectiveBinding$2.onChange(Bindings.java:156)
at com.sun.javafx.runtime.location.AbstractLocation$1.onAction(AbstractLocation.java:220)
at com.sun.javafx.runtime.location.AbstractLocation$1.onAction(AbstractLocation.java:217)
at com.sun.javafx.runtime.location.AbstractLocation.iterateChildren(AbstractLocation.java:182)
at com.sun.javafx.runtime.location.AbstractLocation.invalidateDependencies(AbstractLocation.java:254)
at com.sun.javafx.runtime.location.SequenceVariable.notifyListeners(SequenceVariable.java:150)
at com.sun.javafx.runtime.location.SequenceVariable.replaceSlice(SequenceVariable.java:324)
at com.sun.javafx.runtime.location.SequenceVariable.insert(SequenceVariable.java:442)
at javafxapplication3.FixedRootScene.setContent(FixedRootScene.fx:139)
at javafxapplication3.FixedRootScene.setContent(FixedRootScene.fx:139)
at javafxapplication3.FixedRootScene$1.lambda(FixedRootScene.fx:109)
at javafxapplication3.FixedRootScene$1.lambda(FixedRootScene.fx:109)
at javafxapplication3.FixedRootScene$1.invoke(FixedRootScene.fx:106)
at javafxapplication3.FixedRootScene$1.invoke(FixedRootScene.fx:106)
at javafxapplication3.FixedRootScene$1.invoke(FixedRootScene.fx:106)
at javafxapplication3.FixedRootScene$1.invoke(FixedRootScene.fx:106)
at com.sun.javafx.scene.control.ButtonBaseBehavior.mouseRelease(ButtonBaseBehavior.fx:78)
at com.sun.javafx.scene.control.caspian.AbstractButtonSkin$4.lambda(AbstractButtonSkin.fx:68)
at com.sun.javafx.scene.control.caspian.AbstractButtonSkin$4.invoke(AbstractButtonSkin.fx:68)
at com.sun.javafx.scene.control.caspian.AbstractButtonSkin$4.invoke(AbstractButtonSkin.fx:68)
at javafx.scene.Node.impl_processMouseEvent(Node.fx:1679)
at javafx.scene.Node.preprocessMouseEvent(Node.fx:1705)
at javafx.scene.Scene$MouseHandler.process(Scene.fx:665)
at javafx.scene.Scene$MouseHandler.process(Scene.fx:550)
at javafx.scene.Scene.impl_processMouseEvent(Scene.fx:368)
at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.fx:496)
at com.sun.javafx.tk.swing.SwingScene$SwingScenePanel.doMouseEvent(SwingScene.java:388)
at com.sun.javafx.tk.swing.SwingScene$SwingScenePanel.mouseReleased(SwingScene.java:408)
at java.awt.Component.processMouseEvent(Component.java:6134)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3265)
at java.awt.Component.processEvent(Component.java:5899)
at java.awt.Container.processEvent(Container.java:2023)
at java.awt.Component.dispatchEventImpl(Component.java:4501)
at java.awt.Container.dispatchEventImpl(Container.java:2081)
at java.awt.Component.dispatchEvent(Component.java:4331)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4301)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3965)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3895)
at java.awt.Container.dispatchEventImpl(Container.java:2067)
at java.awt.Window.dispatchEventImpl(Window.java:2458)
at java.awt.Component.dispatchEvent(Component.java:4331)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)

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