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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)