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illegal assignment of group.content: group=Group node=Rectangle
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 javafx.scene.control.Button.fire(Button.fx:50)	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)