java.lang.NoClassDefFoundError: Could not initialize class org.netbeans.api.javafx.composer.model.base.TreeItemValue
   at org.netbeans.api.javafx.composer.components.control.experimental.TreeViewModel.init(TreeViewModel.java:88)
   at org.netbeans.api.javafx.composer.model.factory.ModelObjectFeatureFactory.createNewInstance(ModelObjectFeatureFactory.java:154)
   at org.netbeans.api.javafx.composer.model.factory.ModelObjectFeatureFactory.createNewInstanceInContainerFeature(ModelObjectFeatureFactory.java:81)
   at org.netbeans.api.javafx.composer.model.factory.ModelObjectFactory$1.run(ModelObjectFactory.java:103)
   at org.netbeans.api.javafx.composer.kernel.ModelManager$4.run(ModelManager.java:271)
   at org.openide.util.Mutex.writeAccess(Mutex.java:472)
   at org.netbeans.api.javafx.composer.kernel.ModelManager.writeAccess(ModelManager.java:255)
   at org.netbeans.api.javafx.composer.model.factory.ModelObjectFactory.createNewInstance(ModelObjectFactory.java:125)
   at org.netbeans.modules.javafx.composer.design.control.DragAndDropHandler.runModelAddNode(DragAndDropHandler.java:227)
   at org.netbeans.modules.javafx.composer.design.control.DragAndDropHandler.addNodeModel(DragAndDropHandler.java:220)
   at org.netbeans.modules.javafx.composer.design.control.DragAndDropHandler.access$400(DragAndDropHandler.java:81)
   at org.netbeans.modules.javafx.composer.design.control.DragAndDropHandler$2.run(DragAndDropHandler.java:205)
   at org.netbeans.api.javafx.composer.kernel.ModelManager$4.run(ModelManager.java:271)
   at org.openide.util.Mutex.writeAccess(Mutex.java:472)
   at org.netbeans.api.javafx.composer.kernel.ModelManager.writeAccess(ModelManager.java:255)
   at org.netbeans.modules.javafx.composer.design.control.DragAndDropHandler.drop(DragAndDropHandler.java:197)
   at org.netbeans.modules.javafx.composer.design.control.SceneControlPane.drop(SceneControlPane.java:556)
   at java.awt.dnd.DropTarget.drop(DropTarget.java:434)
   at sun.awt.dnd.SunDropTargetContextPeer.processDropMessage(SunDropTargetContextPeer.java:519)
   at sun.awt.dnd.SunDropTargetContextPeer$EventDispatcher.dispatchDropEvent(SunDropTargetContextPeer.java:832)
   at sun.awt.dnd.SunDropTargetContextPeer$EventDispatcher.dispatchEvent(SunDropTargetContextPeer.java:756)
   at sun.awt.dnd.SunDropTargetEvent.dispatch(SunDropTargetEvent.java:30)
   at java.awt.Component.dispatchEventImpl(Component.java:4487)
   at java.awt.Container.dispatchEventImpl(Container.java:2099)
   at java.awt.Component.dispatchEvent(Component.java:4460)
   at java.awt.LightweightDispatcher.retargetMouseEvent(LightweightDispatcher.java:4577)
   at java.awt.LightweightDispatcher.processDropTargetEvent(LightweightDispatcher.java:4312)
   at java.awt.LightweightDispatcher.dispatchEvent(LightweightDispatcher.java:4163)
   at java.awt.Container.dispatchEventImpl(Container.java:2085)
   at java.awt.Window.dispatchEventImpl(Window.java:2478)
   at java.awt.Component.dispatchEvent(Component.java:4460)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
   at com.sun.embeddedswing.EmbeddedEventQueue.dispatchEvent(EmbeddedEventQueue.java:448)
   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)