java.lang.NullPointerException
   at fr.eseo.woodward.vdb.merise.editor.ui.scene.MeriseScene$AcceptNodeProvider.accept(MeriseScene.java:633)
   at org.netbeans.modules.visual.action.AcceptAction.drop(AcceptAction.java:0)
   at org.netbeans.api.visual.action.WidgetAction$Chain.drop(WidgetAction.java:0)
   at org.netbeans.api.visual.widget.SceneComponent$Operator$18.operate(SceneComponent.java:0)
   at org.netbeans.api.visual.widget.SceneComponent.processLocationOperator(SceneComponent.java:0)
   at org.netbeans.api.visual.widget.SceneComponent.processLocationOperator(SceneComponent.java:0)
   at org.netbeans.api.visual.widget.SceneComponent.drop(SceneComponent.java:0)
   at java.awt.dnd.DropTarget.drop(DropTarget.java:446)
   at sun.awt.dnd.SunDropTargetContextPeer.processDropMessage(SunDropTargetContextPeer.java:529)
   at sun.awt.X11.XDropTargetContextPeer.processDropMessage(XDropTargetContextPeer.java:183)
   at sun.awt.dnd.SunDropTargetContextPeer$EventDispatcher.dispatchDropEvent(SunDropTargetContextPeer.java:842)
   at sun.awt.dnd.SunDropTargetContextPeer$EventDispatcher.dispatchEvent(SunDropTargetContextPeer.java:766)
   at sun.awt.dnd.SunDropTargetEvent.dispatch(SunDropTargetEvent.java:48)
   at java.awt.Component.dispatchEventImpl(Component.java:4484)
   at java.awt.Container.dispatchEventImpl(Container.java:2103)
   at java.awt.Component.dispatchEvent(Component.java:4455)
   at java.awt.LightweightDispatcher.retargetMouseEvent(LightweightDispatcher.java:4633)
   at java.awt.LightweightDispatcher.processDropTargetEvent(LightweightDispatcher.java:4368)
   at java.awt.LightweightDispatcher.dispatchEvent(LightweightDispatcher.java:4222)
   at java.awt.Container.dispatchEventImpl(Container.java:2089)
   at java.awt.Window.dispatchEventImpl(Window.java:2517)
   at java.awt.Component.dispatchEvent(Component.java:4455)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:649)
   at java.awt.EventQueue.access$000(EventQueue.java:96)
   at java.awt.EventQueue$1.run(EventQueue.java:608)
   at java.awt.EventQueue$1.run(EventQueue.java:606)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:105)
   at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:116)
   at java.awt.EventQueue$2.run(EventQueue.java:622)
   at java.awt.EventQueue$2.run(EventQueue.java:620)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:105)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:619)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:0)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:275)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:200)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:190)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:185)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:177)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:138)